What Are Greenhouse Gases and Where Do They Come From?
The Keeling Curve Explained
How Do Greenhouse Gases Work?
Water Vapor's Role in Climate Change
Ocean Acidification and Marine Life
The Sweet Science of Chocolate
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Check local listings for broadcast dates and times.","avatar":"https://secure.gravatar.com/avatar/d3874a881a1fe56a99098a4feea236c8?s=600&d=blank&r=g","twitter":null,"facebook":null,"instagram":null,"linkedin":null,"sites":[{"site":"quest","roles":["editor"]}],"headData":{"title":"QUEST Staff | KQED","description":null,"ogImgSrc":"https://secure.gravatar.com/avatar/d3874a881a1fe56a99098a4feea236c8?s=600&d=blank&r=g","twImgSrc":"https://secure.gravatar.com/avatar/d3874a881a1fe56a99098a4feea236c8?s=600&d=blank&r=g"},"isLoading":false,"link":"/author/quest"},"melissaefellet":{"type":"authors","id":"10331","meta":{"index":"authors_1591205172","id":"10331","found":true},"name":"Melissae Fellet","firstName":"Melissae","lastName":"Fellet","slug":"melissaefellet","email":"melissae.fellet@gmail.com","display_author_email":false,"staff_mastheads":[],"title":null,"bio":"Melissae Fellet is a freelance science writer obsessed with electrons, atoms and molecules. Writing about chemistry, physics and technology, she hopes to reveal how the invisible building blocks of matter influence things like plastics, perfumed shampoos and the speedy computer chips we use everyday. She holds a BS in biochemistry and microbiology from the University of Florida and a PhD in chemistry from Washington University in St. Louis. She spends sunny days at her home in Santa Cruz either watching otters in the bay or tromping around the redwood forests.","avatar":"https://secure.gravatar.com/avatar/47ca62221ec1d28f17ff031462d02e0d?s=600&d=blank&r=g","twitter":null,"facebook":null,"instagram":null,"linkedin":null,"sites":[{"site":"quest","roles":["subscriber"]}],"headData":{"title":"Melissae Fellet | KQED","description":null,"ogImgSrc":"https://secure.gravatar.com/avatar/47ca62221ec1d28f17ff031462d02e0d?s=600&d=blank&r=g","twImgSrc":"https://secure.gravatar.com/avatar/47ca62221ec1d28f17ff031462d02e0d?s=600&d=blank&r=g"},"isLoading":false,"link":"/author/melissaefellet"}},"breakingNewsReducer":{},"campaignFinanceReducer":{},"firebase":{"requesting":{},"requested":{},"timestamps":{},"data":{},"ordered":{},"auth":{"isLoaded":false,"isEmpty":true},"authError":null,"profile":{"isLoaded":false,"isEmpty":true},"listeners":{"byId":{},"allIds":[]},"isInitializing":false,"errors":[]},"navBarReducer":{"navBarId":"home","fullView":true,"showPlayer":false},"navMenuReducer":{"menus":[{"key":"menu1","items":[{"name":"News","link":"/","type":"title"},{"name":"Politics","link":"/politics"},{"name":"Science","link":"/science"},{"name":"Education","link":"/educationnews"},{"name":"Housing","link":"/housing"},{"name":"Immigration","link":"/immigration"},{"name":"Criminal Justice","link":"/criminaljustice"},{"name":"Silicon Valley","link":"/siliconvalley"},{"name":"Forum","link":"/forum"},{"name":"The California Report","link":"/californiareport"}]},{"key":"menu2","items":[{"name":"Arts & Culture","link":"/arts","type":"title"},{"name":"Critics’ Picks","link":"/thedolist"},{"name":"Cultural Commentary","link":"/artscommentary"},{"name":"Food & Drink","link":"/food"},{"name":"Bay Area Hip-Hop","link":"/bayareahiphop"},{"name":"Rebel Girls","link":"/rebelgirls"},{"name":"Arts Video","link":"/artsvideos"}]},{"key":"menu3","items":[{"name":"Podcasts","link":"/podcasts","type":"title"},{"name":"Bay Curious","link":"/podcasts/baycurious"},{"name":"Rightnowish","link":"/podcasts/rightnowish"},{"name":"The Bay","link":"/podcasts/thebay"},{"name":"On Our Watch","link":"/podcasts/onourwatch"},{"name":"Mindshift","link":"/podcasts/mindshift"},{"name":"Consider This","link":"/podcasts/considerthis"},{"name":"Political Breakdown","link":"/podcasts/politicalbreakdown"}]},{"key":"menu4","items":[{"name":"Live Radio","link":"/radio","type":"title"},{"name":"TV","link":"/tv","type":"title"},{"name":"Events","link":"/events","type":"title"},{"name":"For Educators","link":"/education","type":"title"},{"name":"Support KQED","link":"/support","type":"title"},{"name":"About","link":"/about","type":"title"},{"name":"Help Center","link":"https://kqed-helpcenter.kqed.org/s","type":"title"}]}]},"pagesReducer":{},"postsReducer":{"stream_live":{"type":"live","id":"stream_live","audioUrl":"https://streams.kqed.org/kqedradio","title":"Live Stream","excerpt":"Live Stream information currently unavailable.","link":"/radio","featImg":"","label":{"name":"KQED Live","link":"/"}},"stream_kqedNewscast":{"type":"posts","id":"stream_kqedNewscast","audioUrl":"https://www.kqed.org/.stream/anon/radio/RDnews/newscast.mp3?_=1","title":"KQED Newscast","featImg":"","label":{"name":"88.5 FM","link":"/"}},"quest_40413":{"type":"posts","id":"quest_40413","meta":{"index":"posts_1591205157","site":"quest","id":"40413","score":null,"sort":[1467324044000]},"guestAuthors":[],"slug":"how-do-fireworks-work","title":"How Do Fireworks Work?","publishDate":1467324044,"format":"standard","headTitle":"QUEST | KQED Science","labelTerm":{"site":"quest"},"content":"\u003cp>\u003cem>Originally published on July 4, 2012.\u003c/em>\u003c/p>\n\u003cp>From holidays like the Fourth of July to victories, fireworks mean celebration. And to me, they’re a celebration of chemistry too. \u003ca href=\"http://scifun.chem.wisc.edu/chemweek/fireworks/fireworks.htm\">Atoms and reactions\u003c/a> power the colors, sounds and smoke of fireworks.\u003c/p>\n\u003cp>The first firecracker was discovered in China about 1,000 years ago. Called black powder, this explosive is a mixture of potassium nitrate, charcoal and sulfur. You only need the first two ingredients, an oxidizing agent and a fuel, to start the explosion. The oxidizing agent, often a perchlorate or nitrate salt, releases oxygen gas that feeds the fire in a firework. The fuel reacts with the oxidizing agent to create the gas. The sulfur in black powder intensifies and continues the reaction between the other two ingredients. Learn more about the chemistry of fireworks from the \u003ca href=\"https://www.acs.org/content/acs/en.html\" target=\"_blank\">American Chemical Society\u003c/a>:\u003c/p>\n\u003cp>\u003c!-- iframe plugin v.4.3 wordpress.org/plugins/iframe/ -->\u003cbr>\n\u003ciframe width=\"640\" height=\"360\" src=\"https://www.youtube.com/embed/nPHegSulI_M\" frameborder=\"0\" scrolling=\"yes\" class=\"iframe-class\">\u003c/iframe>\u003c/p>\n\u003cp>Pyrotechnicians often add metal salts to make colorful fireworks. Here’s where that color comes from: Heating atoms of sodium, barium or strontium pumps energy into the electrons whizzing around each nucleus. Those energized electrons shoot up to higher locations in the atom. As they fall back down to their usual positions, the electrons lose their extra energy as visible light.\u003c/p>\n\u003cp>[ad fullwidth]\u003c/p>\n\u003cp>The amount of energy released during this process – which depends on the element – is related to the color of the light that we see. Higher energy, like that released by copper atoms, corresponds to a shorter wavelength of light towards the blue end of the spectrum. Red light from strontium atoms has a longer wavelength and lower energy. (The same process gives neon lights their color too. Electricity energizes the neon, xenon or argon in the lights.)\u003c/p>\n\u003cp>Loud bangs come from confining the explosions in a shell, much like a grenade. Gases expand faster than the speed of sound when the shell bursts, creating a loud sonic boom.\u003c/p>\n\u003cp>An abandoned recipe for crackling fireworks called \u003ca href=\"http://www.youtube.com/watch?v=ix8uHBtxxcE\">dragon eggs\u003c/a> shows how chemists control the ingredients in the firework to get sound effects too. The oxidizing agent in this recipe is lead oxide, which becomes lead atoms as the firework burns. These atoms vaporize in the flame. And those vapors create off little crackles as they expand.\u003c/p>\n\u003cp>Whistling fireworks are more tricky. Pyrotechnicians need to find the right ingredients so that the mixture burns just enough to push air out of its tube -- but doesn’t detonate with a bang.\u003c/p>\n\u003cp>The starburst patterns of fireworks depend on how the designers pack explosive pellets into a shell. For a look at the innards of a firework before it explodes, check out \u003ca href=\"http://www.pbs.org/wgbh/nova/fireworks/anat_nf.html\">this diagram\u003c/a> from NOVA Online.\u003c/p>\n\u003cp>In case you’re worried about the environmental effects of the perchlorate oxidizers or metal colorants, fear not. Chemists are developing recipes for \u003ca href=\"http://pubs.acs.org/cen/coverstory/86/8626cover.html\">environmentally-friendly fireworks\u003c/a> too.\u003c/p>\n\u003cp>\u003c/p>\n\u003cp>Enjoy the fireworks this holiday and stay safe! For those looking to host their own fireworks shows, check your local laws first. It’s illegal where I live.\u003c/p>\n\n","blocks":[],"excerpt":"From colors to crackles, fireworks are all about chemistry.","status":"publish","parent":0,"modified":1474398309,"stats":{"hasAudio":false,"hasVideo":true,"hasChartOrMap":true,"iframeSrcs":["https://www.youtube.com/embed/nPHegSulI_M"],"hasGoogleForm":false,"hasGallery":false,"hasHearkenModule":false,"hasPolis":false,"paragraphCount":14,"wordCount":497},"headData":{"title":"How Do Fireworks Work? | KQED","description":"From colors to crackles, fireworks are all about chemistry.","ogTitle":"","ogDescription":"","ogImgId":"","twTitle":"","twDescription":"","twImgId":""},"disqusIdentifier":"40413 http://science.kqed.org/quest/?p=40413","disqusUrl":"https://ww2.kqed.org/quest/2016/06/30/how-do-fireworks-work/","disqusTitle":"How Do Fireworks Work?","path":"/quest/40413/how-do-fireworks-work","audioTrackLength":null,"parsedContent":[{"type":"contentString","content":"\u003cdiv class=\"post-body\">\u003cp>\u003cp>\u003cem>Originally published on July 4, 2012.\u003c/em>\u003c/p>\n\u003cp>From holidays like the Fourth of July to victories, fireworks mean celebration. And to me, they’re a celebration of chemistry too. \u003ca href=\"http://scifun.chem.wisc.edu/chemweek/fireworks/fireworks.htm\">Atoms and reactions\u003c/a> power the colors, sounds and smoke of fireworks.\u003c/p>\n\u003cp>The first firecracker was discovered in China about 1,000 years ago. Called black powder, this explosive is a mixture of potassium nitrate, charcoal and sulfur. You only need the first two ingredients, an oxidizing agent and a fuel, to start the explosion. The oxidizing agent, often a perchlorate or nitrate salt, releases oxygen gas that feeds the fire in a firework. The fuel reacts with the oxidizing agent to create the gas. The sulfur in black powder intensifies and continues the reaction between the other two ingredients. Learn more about the chemistry of fireworks from the \u003ca href=\"https://www.acs.org/content/acs/en.html\" target=\"_blank\">American Chemical Society\u003c/a>:\u003c/p>\n\u003cp>\u003c!-- iframe plugin v.4.3 wordpress.org/plugins/iframe/ -->\u003cbr>\n\u003ciframe width=\"640\" height=\"360\" src=\"https://www.youtube.com/embed/nPHegSulI_M\" frameborder=\"0\" scrolling=\"yes\" class=\"iframe-class\">\u003c/iframe>\u003c/p>\n\u003cp>Pyrotechnicians often add metal salts to make colorful fireworks. Here’s where that color comes from: Heating atoms of sodium, barium or strontium pumps energy into the electrons whizzing around each nucleus. Those energized electrons shoot up to higher locations in the atom. As they fall back down to their usual positions, the electrons lose their extra energy as visible light.\u003c/p>\n\u003cp>\u003c/p>\u003c/div>","attributes":{"named":{},"numeric":[]}},{"type":"component","content":"","name":"ad","attributes":{"named":{"label":"fullwidth"},"numeric":["fullwidth"]}},{"type":"contentString","content":"\u003cdiv class=\"post-body\">\u003cp>\u003c/p>\n\u003cp>The amount of energy released during this process – which depends on the element – is related to the color of the light that we see. Higher energy, like that released by copper atoms, corresponds to a shorter wavelength of light towards the blue end of the spectrum. Red light from strontium atoms has a longer wavelength and lower energy. (The same process gives neon lights their color too. Electricity energizes the neon, xenon or argon in the lights.)\u003c/p>\n\u003cp>Loud bangs come from confining the explosions in a shell, much like a grenade. Gases expand faster than the speed of sound when the shell bursts, creating a loud sonic boom.\u003c/p>\n\u003cp>An abandoned recipe for crackling fireworks called \u003ca href=\"http://www.youtube.com/watch?v=ix8uHBtxxcE\">dragon eggs\u003c/a> shows how chemists control the ingredients in the firework to get sound effects too. The oxidizing agent in this recipe is lead oxide, which becomes lead atoms as the firework burns. These atoms vaporize in the flame. And those vapors create off little crackles as they expand.\u003c/p>\n\u003cp>Whistling fireworks are more tricky. Pyrotechnicians need to find the right ingredients so that the mixture burns just enough to push air out of its tube -- but doesn’t detonate with a bang.\u003c/p>\n\u003cp>The starburst patterns of fireworks depend on how the designers pack explosive pellets into a shell. For a look at the innards of a firework before it explodes, check out \u003ca href=\"http://www.pbs.org/wgbh/nova/fireworks/anat_nf.html\">this diagram\u003c/a> from NOVA Online.\u003c/p>\n\u003cp>In case you’re worried about the environmental effects of the perchlorate oxidizers or metal colorants, fear not. Chemists are developing recipes for \u003ca href=\"http://pubs.acs.org/cen/coverstory/86/8626cover.html\">environmentally-friendly fireworks\u003c/a> too.\u003c/p>\n\u003cp>\u003c/p>\n\u003cp>Enjoy the fireworks this holiday and stay safe! For those looking to host their own fireworks shows, check your local laws first. It’s illegal where I live.\u003c/p>\n\n\u003c/div>\u003c/p>","attributes":{"named":{},"numeric":[]}}],"link":"/quest/40413/how-do-fireworks-work","authors":["10331"],"categories":["quest_5"],"tags":["quest_11255","quest_11256","quest_1378","quest_13"],"featImg":"quest_40414","label":"quest"},"quest_17429":{"type":"posts","id":"quest_17429","meta":{"index":"posts_1591205157","site":"quest","id":"17429","score":null,"sort":[1447164000000]},"guestAuthors":[],"slug":"secret-life-of-a-raindrop","title":"The Secret Life of a Raindrop","publishDate":1447164000,"format":"video","headTitle":"QUEST | KQED Science","labelTerm":{"term":12824,"site":"quest"},"content":"\u003cp>[contextly_auto_sidebar id=\"ngqJALTleeosh2JhvSQygf3ACavDlNee\"]\u003c/p>\n\u003cp>According to a widely held belief, you can’t squeeze water from a rock. But researchers from UC Berkeley who are trying to better understand where water is stored in nature are challenging that old adage.\u003c/p>\n\u003cp>After nearly ten years of studying a steep, 20-square-mile area near the \u003ca href=\"https://en.wikipedia.org/wiki/South_Fork_Eel_River\" target=\"_blank\">South Fork Eel River\u003c/a> in coastal Mendocino County, the scientists have shown that for trees and other plants, deep and highly fractured rock formations beneath the Earth’s surface are a much larger water reservoir than was previously known.\u003c/p>\n\u003cfigure id=\"attachment_94852\" class=\"wp-caption aligncenter\" style=\"max-width: 900px\">\u003cimg class=\"size-full wp-image-94852\" src=\"http://ww2.kqed.org/quest/wp-content/uploads/sites/39/2015/11/LiDAR3D_Landslide_Tenmile_900_678_80auto.jpg\" alt=\"LiDAR image illustrating a deep seated landslide underneath vegetative cover at the South Fork Eel River confluence with Tenmile Creek.\" width=\"900\" height=\"678\" srcset=\"https://ww2.kqed.org/app/uploads/sites/39/2015/11/LiDAR3D_Landslide_Tenmile_900_678_80auto.jpg 900w, https://ww2.kqed.org/app/uploads/sites/39/2015/11/LiDAR3D_Landslide_Tenmile_900_678_80auto-400x301.jpg 400w, https://ww2.kqed.org/app/uploads/sites/39/2015/11/LiDAR3D_Landslide_Tenmile_900_678_80auto-800x603.jpg 800w\" sizes=\"(max-width: 900px) 100vw, 900px\">\u003cfigcaption class=\"wp-caption-text\">LiDAR image illustrating a deep seated landslide underneath vegetative cover at the South Fork Eel River confluence with Tenmile Creek. \u003ccite>(Credit: Collin Bode, 2010)\u003c/cite>\u003c/figcaption>\u003c/figure>\n\u003cp>The work to understand the role that “rock water” plays in the hydrologic cycle began in 2006 when researchers from UC Berkeley embarked on a multi-year study sponsored by the \u003ca href=\"http://www.wmkeck.org/\" target=\"_blank\">Keck Foundation \u003c/a>called the Hydrowatch project. It was designed to precisely monitor and measure the pathways of water in Mendocino County’s \u003ca href=\"http://angelo.berkeley.edu/\" target=\"_blank\">Angelo Coast Range Reserve \u003c/a>as it cycles from the groundwater table to the tops of trees and into the atmosphere.\u003c/p>\n\u003cp>“We were really interested in learning the fate of precipitation in the land surface,” explains \u003ca href=\"http://nature.berkeley.edu/dawsonlab/people/todd-dawson/\" target=\"_blank\">Todd Dawson\u003c/a>, professor of \u003ca href=\"https://ib.berkeley.edu/\" target=\"_blank\">Integrative Biology at UC Berkeley\u003c/a>. “So really trying to figure out when precipitation arrives at the site, where does it get into the rock, where does it get into the stream, how does is recharge the ground water, how much of it is used by the vegetation, and ultimately, how much of it ends up in the streams and going back out to the Pacific Ocean.”\u003c/p>\n\u003cp>[ad fullwidth]\u003c/p>\n\u003cp>Learning more about where water consumed by forests, or flowing through streams actually comes from is important, the scientists say, in better understanding the impact of climate change.\u003c/p>\n\u003cp>In 2013, the project expanded to become part of a landmark study sponsored by the National Science Foundation called the \u003ca href=\"http://criticalzone.org/national/\" target=\"_blank\">Critical Zone Observatories Program\u003c/a>. Today, the site is called the \u003ca href=\"http://criticalzone.org/eel/\" target=\"_blank\">Eel River CZO\u003c/a> and it’s part of a national network of ten similar watershed observation sites across the United States - each with unique climate, geology and vegetation.\u003c/p>\n\u003cfigure id=\"attachment_94854\" class=\"wp-caption aligncenter\" style=\"max-width: 640px\">\u003cimg class=\"size-large wp-image-94854\" src=\"http://ww2.kqed.org/quest/wp-content/uploads/sites/39/2015/11/CZONationalMap-1440x812.jpg\" alt=\"The ten environmental observatories within the CZO Network study the Earth's outer skin - where water, atmosphere, soil, ecosystems interact.\" width=\"640\" height=\"361\" srcset=\"https://ww2.kqed.org/app/uploads/sites/39/2015/11/CZONationalMap-1440x812.jpg 1440w, https://ww2.kqed.org/app/uploads/sites/39/2015/11/CZONationalMap-400x225.jpg 400w, https://ww2.kqed.org/app/uploads/sites/39/2015/11/CZONationalMap-800x451.jpg 800w, https://ww2.kqed.org/app/uploads/sites/39/2015/11/CZONationalMap-1180x665.jpg 1180w, https://ww2.kqed.org/app/uploads/sites/39/2015/11/CZONationalMap-960x541.jpg 960w\" sizes=\"(max-width: 640px) 100vw, 640px\">\u003cfigcaption class=\"wp-caption-text\">The ten environmental observatories within the CZO Network study the Earth's outer skin - where water, atmosphere, soil, ecosystems interact. \u003ccite>(Credit: National Critical Zone Observatories)\u003c/cite>\u003c/figcaption>\u003c/figure>\n\u003cp>The term “critical zone” is relatively new and is being used by scientists to define the zone that is tectonically, geologically and biologically active across the Earth’s surface. It represents a groundbreaking new approach to studying the \u003ca href=\"https://en.wikipedia.org/wiki/Water_cycle\" target=\"_blank\">hydrologic cycle\u003c/a>.\u003c/p>\n\u003cp>“The critical zone really tries to capture this idea of the zone between bedrock beneath our feet, and the top of the vegetation where the trees are interacting with the atmosphere,” explains Dawson. “So it’s everything in between. It’s rock, it’s soil, it’s the vegetation, and it’s the atmosphere that’s coupled to that vegetation. That’s the critical zone. It’s where life meets rock.”\u003c/p>\n\u003cfigure id=\"attachment_94858\" class=\"wp-caption aligncenter\" style=\"max-width: 640px\">\u003cimg class=\"size-large wp-image-94858\" src=\"http://ww2.kqed.org/quest/wp-content/uploads/sites/39/2015/11/czone_chorover_et_al_catalina_jemez_czo-1440x1667.jpg\" alt=\"The critical zone is defined as the zone that is tectonically, geologically and biologically active across the Earth’s surface.\" width=\"640\" height=\"741\" srcset=\"https://ww2.kqed.org/app/uploads/sites/39/2015/11/czone_chorover_et_al_catalina_jemez_czo-1440x1667.jpg 1440w, https://ww2.kqed.org/app/uploads/sites/39/2015/11/czone_chorover_et_al_catalina_jemez_czo-400x463.jpg 400w, https://ww2.kqed.org/app/uploads/sites/39/2015/11/czone_chorover_et_al_catalina_jemez_czo-800x926.jpg 800w, https://ww2.kqed.org/app/uploads/sites/39/2015/11/czone_chorover_et_al_catalina_jemez_czo-1180x1366.jpg 1180w, https://ww2.kqed.org/app/uploads/sites/39/2015/11/czone_chorover_et_al_catalina_jemez_czo-960x1112.jpg 960w\" sizes=\"(max-width: 640px) 100vw, 640px\">\u003cfigcaption class=\"wp-caption-text\">The critical zone is defined as the zone that is tectonically, geologically and biologically active across the Earth’s surface. \u003ccite>(Credit: Chorover et al., Catalina Jemez CZO)\u003c/cite>\u003c/figcaption>\u003c/figure>\n\u003cp>Scientists across a broad range of earth, life and computer sciences – from microbiologists to geologists to electrical engineers - are now working together to conduct research and share data within the most comprehensive hydrologic science network in the world.\u003c/p>\n\u003cp>“We’ve rarely studied all those things together at one site,” says \u003ca href=\"http://criticalzone.org/eel/people/person/dietrich-william/\" target=\"_blank\">William Dietrich\u003c/a>, professor of Earth and Planetary Science at UC Berkeley and lead Investigator at the Eel River CZO. “Geologists rarely work with microbiologists, and now all of us are working together at the same site to merge our information to see how each of the pieces work interdependently and impact the other pieces.”\u003c/p>\n\u003cfigure id=\"attachment_94856\" class=\"wp-caption aligncenter\" style=\"max-width: 640px\">\u003cimg class=\"size-large wp-image-94856\" src=\"http://ww2.kqed.org/quest/wp-content/uploads/sites/39/2015/11/IMG_3788-1440x1080.jpg\" alt=\"Researchers collect soil and rock samples at the Eel River CZO.\" width=\"640\" height=\"480\" srcset=\"https://ww2.kqed.org/app/uploads/sites/39/2015/11/IMG_3788-1440x1080.jpg 1440w, https://ww2.kqed.org/app/uploads/sites/39/2015/11/IMG_3788-400x300.jpg 400w, https://ww2.kqed.org/app/uploads/sites/39/2015/11/IMG_3788-800x600.jpg 800w, https://ww2.kqed.org/app/uploads/sites/39/2015/11/IMG_3788-1180x885.jpg 1180w, https://ww2.kqed.org/app/uploads/sites/39/2015/11/IMG_3788-960x720.jpg 960w\" sizes=\"(max-width: 640px) 100vw, 640px\">\u003cfigcaption class=\"wp-caption-text\">Researchers collect soil and rock samples at the Eel River CZO. \u003ccite>(Credit: William Dietrich)\u003c/cite>\u003c/figcaption>\u003c/figure>\n\u003cp>To gather information, researchers at the ten national sites scale trees and towers hundreds of feet tall and drill deep into bedrock to place sensors that collect climate information. Their instruments transmit real-time measurements of things like air temperature, rock moisture, soil, air and water content and stream flow.\u003c/p>\n\u003cp>Some of the sites have so many instruments that the vegetation and landscapes look almost bionic. One tree in UC Merced’s \u003ca href=\"http://criticalzone.org/sierra/\" target=\"_blank\">Southern Sierra CZO\u003c/a> on the \u003ca href=\"https://en.wikipedia.org/wiki/North_Fork_Kings_River\" target=\"_blank\">North Fork Kings River\u003c/a> in Fresno County has been dubbed the “critical zone tree” because it’s adorned with nearly 200 sensors that measure things like humidity, temperature, and water movement through the tree via sap flux.\u003c/p>\n\u003cfigure id=\"attachment_94860\" class=\"wp-caption aligncenter\" style=\"max-width: 640px\">\u003cimg class=\"size-large wp-image-94860\" src=\"http://ww2.kqed.org/quest/wp-content/uploads/sites/39/2015/11/critical_zone_tree_1-1440x1080.jpg\" alt='The \"critical zone tree\" in UC Merced’s Southern Sierra CZO has nearly 200 sensors.' width=\"640\" height=\"480\" srcset=\"https://ww2.kqed.org/app/uploads/sites/39/2015/11/critical_zone_tree_1-1440x1080.jpg 1440w, https://ww2.kqed.org/app/uploads/sites/39/2015/11/critical_zone_tree_1-400x300.jpg 400w, https://ww2.kqed.org/app/uploads/sites/39/2015/11/critical_zone_tree_1-800x600.jpg 800w, https://ww2.kqed.org/app/uploads/sites/39/2015/11/critical_zone_tree_1-1180x885.jpg 1180w, https://ww2.kqed.org/app/uploads/sites/39/2015/11/critical_zone_tree_1-960x720.jpg 960w\" sizes=\"(max-width: 640px) 100vw, 640px\">\u003cfigcaption class=\"wp-caption-text\">The \"critical zone tree\" in UC Merced’s Southern Sierra CZO has nearly 200 sensors. \u003ccite>(Credit: Southern Sierra CZO)\u003c/cite>\u003c/figcaption>\u003c/figure>\n\u003cp>As a plant physiologist, Dawson’s part in the project is to provide information on the role that plants and trees are playing in how water moves through the Eel River watershed.\u003c/p>\n\u003cp>“Seventy-five to eighty percent of the water on this planet is recycled through agriculture, through forests, through the plants,” he explains. “You take those plants away, you remove that straw in the Earth, that conduit for water to move out of the soil and back into the atmosphere, and that eventually can lead to deserts expanding. It changes the climate. We know for example when trees were cut down in the Amazon, there was less precipitation.”\u003c/p>\n\u003cp>One of the team’s main discoveries was that large amounts of water in the Eel River watershed is stored in the massive network of fractures in the rock that can be tens to hundreds of feet thick. This “rock water reservoir” is hidden deep inside the Earth, away from the influence of evaporation. It sits beneath the soil and above the saturated layer commonly called ground water and occupies the deepest part of what hydrologists call the “unsaturated zone”. Many trees reach their deep roots into this matrix of water-filled rock fissures and use the water stored there when other water sources dry out or become unavailable. Different types of rock store water in different ways.\u003c/p>\n\u003cp>“We are thinking of them as different types of sponges in the subsurface in the way they take up and retain moisture and give back that moisture to the vegetation that is rooted into them,” says Dietrich.\u003c/p>\n\u003cp>In additional to discovering the amount of water stored in underground rock fractures, Dawson and his team have learned that different types of trees actually use the “rock water” in very different ways depending on climate conditions. For example, the rock matrix inside slopes of hills is a key water resource for the largest trees in the watershed, like Douglas firs.\u003c/p>\n\u003cp>Hardwood trees like tanoak, madrone and live oaks rely largely on precipitation. But when drier times come, they shift to using the more stable groundwater below the surface and then may draw on some \"rock water\" in later summer and fall.\u003c/p>\n\u003cfigure id=\"attachment_94861\" class=\"wp-caption aligncenter\" style=\"max-width: 900px\">\u003cimg class=\"size-full wp-image-94861\" src=\"http://ww2.kqed.org/quest/wp-content/uploads/sites/39/2015/11/todd_dawson_trapping_vapor_900_675_80auto.jpg\" alt=\"Todd Dawson trapping water vapor in the Eel River CZO.\" width=\"900\" height=\"675\" srcset=\"https://ww2.kqed.org/app/uploads/sites/39/2015/11/todd_dawson_trapping_vapor_900_675_80auto.jpg 900w, https://ww2.kqed.org/app/uploads/sites/39/2015/11/todd_dawson_trapping_vapor_900_675_80auto-400x300.jpg 400w, https://ww2.kqed.org/app/uploads/sites/39/2015/11/todd_dawson_trapping_vapor_900_675_80auto-800x600.jpg 800w\" sizes=\"(max-width: 900px) 100vw, 900px\">\u003cfigcaption class=\"wp-caption-text\">Todd Dawson trapping water vapor in the Eel River CZO. \u003ccite>(Credit: Anthony Ambrose)\u003c/cite>\u003c/figcaption>\u003c/figure>\n\u003cp>Conifers play a larger role in moving water out of the subsurface areas in winter and early spring, Dawson says. And hardwoods are playing a larger role in summer and fall.\u003c/p>\n\u003cp>“As climate and the forest change over time,” he adds, “this will lead to changes in how water enters and leaves these ecosystems because of what the vegetation on the land surface is composed of.”\u003c/p>\n\u003cp>The work being done within the National Critical Zone Observatories Program is timely because of a growing sense of urgency within the scientific community that as climate is changing and lands are changing because of human use of the land surface, we’re permanently disturbing the way the Earth works.\u003c/p>\n\u003cp>[ad floatright]\u003c/p>\n\u003cp>“If we don’t put a singular focus on understanding the critical zone,” explains Dawson, “as we march into the future and climate continues to change we’re not going to know how to mitigate for the kinds of impacts that humans and climate are actually having on resource balance on planet Earth.”\u003c/p>\n\n","blocks":[],"excerpt":"How old is the water in the stream? The answer could help us endure the dry times ahead. ","status":"publish","parent":0,"modified":1471475873,"stats":{"hasAudio":false,"hasVideo":false,"hasChartOrMap":false,"iframeSrcs":[],"hasGoogleForm":false,"hasGallery":false,"hasHearkenModule":false,"hasPolis":false,"paragraphCount":25,"wordCount":1389},"headData":{"title":"The Secret Life of a Raindrop | KQED","description":"","ogTitle":"","ogDescription":"","ogImgId":"","twTitle":"","twDescription":"","twImgId":""},"disqusIdentifier":"17429 http://science.kqed.org/quest/video/tracking-raindrops/","disqusUrl":"https://ww2.kqed.org/quest/2015/11/10/secret-life-of-a-raindrop/","disqusTitle":"The Secret Life of a Raindrop","videoEmbed":"https://youtu.be/ABGC6SalwJU","path":"/quest/17429/secret-life-of-a-raindrop","audioTrackLength":null,"parsedContent":[{"type":"contentString","content":"\u003cdiv class=\"post-body\">\u003cp>\u003cp>[contextly_auto_sidebar id=\"ngqJALTleeosh2JhvSQygf3ACavDlNee\"]\u003c/p>\n\u003cp>According to a widely held belief, you can’t squeeze water from a rock. But researchers from UC Berkeley who are trying to better understand where water is stored in nature are challenging that old adage.\u003c/p>\n\u003cp>After nearly ten years of studying a steep, 20-square-mile area near the \u003ca href=\"https://en.wikipedia.org/wiki/South_Fork_Eel_River\" target=\"_blank\">South Fork Eel River\u003c/a> in coastal Mendocino County, the scientists have shown that for trees and other plants, deep and highly fractured rock formations beneath the Earth’s surface are a much larger water reservoir than was previously known.\u003c/p>\n\u003cfigure id=\"attachment_94852\" class=\"wp-caption aligncenter\" style=\"max-width: 900px\">\u003cimg class=\"size-full wp-image-94852\" src=\"http://ww2.kqed.org/quest/wp-content/uploads/sites/39/2015/11/LiDAR3D_Landslide_Tenmile_900_678_80auto.jpg\" alt=\"LiDAR image illustrating a deep seated landslide underneath vegetative cover at the South Fork Eel River confluence with Tenmile Creek.\" width=\"900\" height=\"678\" srcset=\"https://ww2.kqed.org/app/uploads/sites/39/2015/11/LiDAR3D_Landslide_Tenmile_900_678_80auto.jpg 900w, https://ww2.kqed.org/app/uploads/sites/39/2015/11/LiDAR3D_Landslide_Tenmile_900_678_80auto-400x301.jpg 400w, https://ww2.kqed.org/app/uploads/sites/39/2015/11/LiDAR3D_Landslide_Tenmile_900_678_80auto-800x603.jpg 800w\" sizes=\"(max-width: 900px) 100vw, 900px\">\u003cfigcaption class=\"wp-caption-text\">LiDAR image illustrating a deep seated landslide underneath vegetative cover at the South Fork Eel River confluence with Tenmile Creek. \u003ccite>(Credit: Collin Bode, 2010)\u003c/cite>\u003c/figcaption>\u003c/figure>\n\u003cp>The work to understand the role that “rock water” plays in the hydrologic cycle began in 2006 when researchers from UC Berkeley embarked on a multi-year study sponsored by the \u003ca href=\"http://www.wmkeck.org/\" target=\"_blank\">Keck Foundation \u003c/a>called the Hydrowatch project. It was designed to precisely monitor and measure the pathways of water in Mendocino County’s \u003ca href=\"http://angelo.berkeley.edu/\" target=\"_blank\">Angelo Coast Range Reserve \u003c/a>as it cycles from the groundwater table to the tops of trees and into the atmosphere.\u003c/p>\n\u003cp>“We were really interested in learning the fate of precipitation in the land surface,” explains \u003ca href=\"http://nature.berkeley.edu/dawsonlab/people/todd-dawson/\" target=\"_blank\">Todd Dawson\u003c/a>, professor of \u003ca href=\"https://ib.berkeley.edu/\" target=\"_blank\">Integrative Biology at UC Berkeley\u003c/a>. “So really trying to figure out when precipitation arrives at the site, where does it get into the rock, where does it get into the stream, how does is recharge the ground water, how much of it is used by the vegetation, and ultimately, how much of it ends up in the streams and going back out to the Pacific Ocean.”\u003c/p>\n\u003cp>\u003c/p>\u003c/div>","attributes":{"named":{},"numeric":[]}},{"type":"component","content":"","name":"ad","attributes":{"named":{"label":"fullwidth"},"numeric":["fullwidth"]}},{"type":"contentString","content":"\u003cdiv class=\"post-body\">\u003cp>\u003c/p>\n\u003cp>Learning more about where water consumed by forests, or flowing through streams actually comes from is important, the scientists say, in better understanding the impact of climate change.\u003c/p>\n\u003cp>In 2013, the project expanded to become part of a landmark study sponsored by the National Science Foundation called the \u003ca href=\"http://criticalzone.org/national/\" target=\"_blank\">Critical Zone Observatories Program\u003c/a>. Today, the site is called the \u003ca href=\"http://criticalzone.org/eel/\" target=\"_blank\">Eel River CZO\u003c/a> and it’s part of a national network of ten similar watershed observation sites across the United States - each with unique climate, geology and vegetation.\u003c/p>\n\u003cfigure id=\"attachment_94854\" class=\"wp-caption aligncenter\" style=\"max-width: 640px\">\u003cimg class=\"size-large wp-image-94854\" src=\"http://ww2.kqed.org/quest/wp-content/uploads/sites/39/2015/11/CZONationalMap-1440x812.jpg\" alt=\"The ten environmental observatories within the CZO Network study the Earth's outer skin - where water, atmosphere, soil, ecosystems interact.\" width=\"640\" height=\"361\" srcset=\"https://ww2.kqed.org/app/uploads/sites/39/2015/11/CZONationalMap-1440x812.jpg 1440w, https://ww2.kqed.org/app/uploads/sites/39/2015/11/CZONationalMap-400x225.jpg 400w, https://ww2.kqed.org/app/uploads/sites/39/2015/11/CZONationalMap-800x451.jpg 800w, https://ww2.kqed.org/app/uploads/sites/39/2015/11/CZONationalMap-1180x665.jpg 1180w, https://ww2.kqed.org/app/uploads/sites/39/2015/11/CZONationalMap-960x541.jpg 960w\" sizes=\"(max-width: 640px) 100vw, 640px\">\u003cfigcaption class=\"wp-caption-text\">The ten environmental observatories within the CZO Network study the Earth's outer skin - where water, atmosphere, soil, ecosystems interact. \u003ccite>(Credit: National Critical Zone Observatories)\u003c/cite>\u003c/figcaption>\u003c/figure>\n\u003cp>The term “critical zone” is relatively new and is being used by scientists to define the zone that is tectonically, geologically and biologically active across the Earth’s surface. It represents a groundbreaking new approach to studying the \u003ca href=\"https://en.wikipedia.org/wiki/Water_cycle\" target=\"_blank\">hydrologic cycle\u003c/a>.\u003c/p>\n\u003cp>“The critical zone really tries to capture this idea of the zone between bedrock beneath our feet, and the top of the vegetation where the trees are interacting with the atmosphere,” explains Dawson. “So it’s everything in between. It’s rock, it’s soil, it’s the vegetation, and it’s the atmosphere that’s coupled to that vegetation. That’s the critical zone. It’s where life meets rock.”\u003c/p>\n\u003cfigure id=\"attachment_94858\" class=\"wp-caption aligncenter\" style=\"max-width: 640px\">\u003cimg class=\"size-large wp-image-94858\" src=\"http://ww2.kqed.org/quest/wp-content/uploads/sites/39/2015/11/czone_chorover_et_al_catalina_jemez_czo-1440x1667.jpg\" alt=\"The critical zone is defined as the zone that is tectonically, geologically and biologically active across the Earth’s surface.\" width=\"640\" height=\"741\" srcset=\"https://ww2.kqed.org/app/uploads/sites/39/2015/11/czone_chorover_et_al_catalina_jemez_czo-1440x1667.jpg 1440w, https://ww2.kqed.org/app/uploads/sites/39/2015/11/czone_chorover_et_al_catalina_jemez_czo-400x463.jpg 400w, https://ww2.kqed.org/app/uploads/sites/39/2015/11/czone_chorover_et_al_catalina_jemez_czo-800x926.jpg 800w, https://ww2.kqed.org/app/uploads/sites/39/2015/11/czone_chorover_et_al_catalina_jemez_czo-1180x1366.jpg 1180w, https://ww2.kqed.org/app/uploads/sites/39/2015/11/czone_chorover_et_al_catalina_jemez_czo-960x1112.jpg 960w\" sizes=\"(max-width: 640px) 100vw, 640px\">\u003cfigcaption class=\"wp-caption-text\">The critical zone is defined as the zone that is tectonically, geologically and biologically active across the Earth’s surface. \u003ccite>(Credit: Chorover et al., Catalina Jemez CZO)\u003c/cite>\u003c/figcaption>\u003c/figure>\n\u003cp>Scientists across a broad range of earth, life and computer sciences – from microbiologists to geologists to electrical engineers - are now working together to conduct research and share data within the most comprehensive hydrologic science network in the world.\u003c/p>\n\u003cp>“We’ve rarely studied all those things together at one site,” says \u003ca href=\"http://criticalzone.org/eel/people/person/dietrich-william/\" target=\"_blank\">William Dietrich\u003c/a>, professor of Earth and Planetary Science at UC Berkeley and lead Investigator at the Eel River CZO. “Geologists rarely work with microbiologists, and now all of us are working together at the same site to merge our information to see how each of the pieces work interdependently and impact the other pieces.”\u003c/p>\n\u003cfigure id=\"attachment_94856\" class=\"wp-caption aligncenter\" style=\"max-width: 640px\">\u003cimg class=\"size-large wp-image-94856\" src=\"http://ww2.kqed.org/quest/wp-content/uploads/sites/39/2015/11/IMG_3788-1440x1080.jpg\" alt=\"Researchers collect soil and rock samples at the Eel River CZO.\" width=\"640\" height=\"480\" srcset=\"https://ww2.kqed.org/app/uploads/sites/39/2015/11/IMG_3788-1440x1080.jpg 1440w, https://ww2.kqed.org/app/uploads/sites/39/2015/11/IMG_3788-400x300.jpg 400w, https://ww2.kqed.org/app/uploads/sites/39/2015/11/IMG_3788-800x600.jpg 800w, https://ww2.kqed.org/app/uploads/sites/39/2015/11/IMG_3788-1180x885.jpg 1180w, https://ww2.kqed.org/app/uploads/sites/39/2015/11/IMG_3788-960x720.jpg 960w\" sizes=\"(max-width: 640px) 100vw, 640px\">\u003cfigcaption class=\"wp-caption-text\">Researchers collect soil and rock samples at the Eel River CZO. \u003ccite>(Credit: William Dietrich)\u003c/cite>\u003c/figcaption>\u003c/figure>\n\u003cp>To gather information, researchers at the ten national sites scale trees and towers hundreds of feet tall and drill deep into bedrock to place sensors that collect climate information. Their instruments transmit real-time measurements of things like air temperature, rock moisture, soil, air and water content and stream flow.\u003c/p>\n\u003cp>Some of the sites have so many instruments that the vegetation and landscapes look almost bionic. One tree in UC Merced’s \u003ca href=\"http://criticalzone.org/sierra/\" target=\"_blank\">Southern Sierra CZO\u003c/a> on the \u003ca href=\"https://en.wikipedia.org/wiki/North_Fork_Kings_River\" target=\"_blank\">North Fork Kings River\u003c/a> in Fresno County has been dubbed the “critical zone tree” because it’s adorned with nearly 200 sensors that measure things like humidity, temperature, and water movement through the tree via sap flux.\u003c/p>\n\u003cfigure id=\"attachment_94860\" class=\"wp-caption aligncenter\" style=\"max-width: 640px\">\u003cimg class=\"size-large wp-image-94860\" src=\"http://ww2.kqed.org/quest/wp-content/uploads/sites/39/2015/11/critical_zone_tree_1-1440x1080.jpg\" alt='The \"critical zone tree\" in UC Merced’s Southern Sierra CZO has nearly 200 sensors.' width=\"640\" height=\"480\" srcset=\"https://ww2.kqed.org/app/uploads/sites/39/2015/11/critical_zone_tree_1-1440x1080.jpg 1440w, https://ww2.kqed.org/app/uploads/sites/39/2015/11/critical_zone_tree_1-400x300.jpg 400w, https://ww2.kqed.org/app/uploads/sites/39/2015/11/critical_zone_tree_1-800x600.jpg 800w, https://ww2.kqed.org/app/uploads/sites/39/2015/11/critical_zone_tree_1-1180x885.jpg 1180w, https://ww2.kqed.org/app/uploads/sites/39/2015/11/critical_zone_tree_1-960x720.jpg 960w\" sizes=\"(max-width: 640px) 100vw, 640px\">\u003cfigcaption class=\"wp-caption-text\">The \"critical zone tree\" in UC Merced’s Southern Sierra CZO has nearly 200 sensors. \u003ccite>(Credit: Southern Sierra CZO)\u003c/cite>\u003c/figcaption>\u003c/figure>\n\u003cp>As a plant physiologist, Dawson’s part in the project is to provide information on the role that plants and trees are playing in how water moves through the Eel River watershed.\u003c/p>\n\u003cp>“Seventy-five to eighty percent of the water on this planet is recycled through agriculture, through forests, through the plants,” he explains. “You take those plants away, you remove that straw in the Earth, that conduit for water to move out of the soil and back into the atmosphere, and that eventually can lead to deserts expanding. It changes the climate. We know for example when trees were cut down in the Amazon, there was less precipitation.”\u003c/p>\n\u003cp>One of the team’s main discoveries was that large amounts of water in the Eel River watershed is stored in the massive network of fractures in the rock that can be tens to hundreds of feet thick. This “rock water reservoir” is hidden deep inside the Earth, away from the influence of evaporation. It sits beneath the soil and above the saturated layer commonly called ground water and occupies the deepest part of what hydrologists call the “unsaturated zone”. Many trees reach their deep roots into this matrix of water-filled rock fissures and use the water stored there when other water sources dry out or become unavailable. Different types of rock store water in different ways.\u003c/p>\n\u003cp>“We are thinking of them as different types of sponges in the subsurface in the way they take up and retain moisture and give back that moisture to the vegetation that is rooted into them,” says Dietrich.\u003c/p>\n\u003cp>In additional to discovering the amount of water stored in underground rock fractures, Dawson and his team have learned that different types of trees actually use the “rock water” in very different ways depending on climate conditions. For example, the rock matrix inside slopes of hills is a key water resource for the largest trees in the watershed, like Douglas firs.\u003c/p>\n\u003cp>Hardwood trees like tanoak, madrone and live oaks rely largely on precipitation. But when drier times come, they shift to using the more stable groundwater below the surface and then may draw on some \"rock water\" in later summer and fall.\u003c/p>\n\u003cfigure id=\"attachment_94861\" class=\"wp-caption aligncenter\" style=\"max-width: 900px\">\u003cimg class=\"size-full wp-image-94861\" src=\"http://ww2.kqed.org/quest/wp-content/uploads/sites/39/2015/11/todd_dawson_trapping_vapor_900_675_80auto.jpg\" alt=\"Todd Dawson trapping water vapor in the Eel River CZO.\" width=\"900\" height=\"675\" srcset=\"https://ww2.kqed.org/app/uploads/sites/39/2015/11/todd_dawson_trapping_vapor_900_675_80auto.jpg 900w, https://ww2.kqed.org/app/uploads/sites/39/2015/11/todd_dawson_trapping_vapor_900_675_80auto-400x300.jpg 400w, https://ww2.kqed.org/app/uploads/sites/39/2015/11/todd_dawson_trapping_vapor_900_675_80auto-800x600.jpg 800w\" sizes=\"(max-width: 900px) 100vw, 900px\">\u003cfigcaption class=\"wp-caption-text\">Todd Dawson trapping water vapor in the Eel River CZO. \u003ccite>(Credit: Anthony Ambrose)\u003c/cite>\u003c/figcaption>\u003c/figure>\n\u003cp>Conifers play a larger role in moving water out of the subsurface areas in winter and early spring, Dawson says. And hardwoods are playing a larger role in summer and fall.\u003c/p>\n\u003cp>“As climate and the forest change over time,” he adds, “this will lead to changes in how water enters and leaves these ecosystems because of what the vegetation on the land surface is composed of.”\u003c/p>\n\u003cp>The work being done within the National Critical Zone Observatories Program is timely because of a growing sense of urgency within the scientific community that as climate is changing and lands are changing because of human use of the land surface, we’re permanently disturbing the way the Earth works.\u003c/p>\n\u003cp>\u003c/p>\u003c/div>","attributes":{"named":{},"numeric":[]}},{"type":"component","content":"","name":"ad","attributes":{"named":{"label":"floatright"},"numeric":["floatright"]}},{"type":"contentString","content":"\u003cdiv class=\"post-body\">\u003cp>\u003c/p>\n\u003cp>“If we don’t put a singular focus on understanding the critical zone,” explains Dawson, “as we march into the future and climate continues to change we’re not going to know how to mitigate for the kinds of impacts that humans and climate are actually having on resource balance on planet Earth.”\u003c/p>\n\n\u003c/div>\u003c/p>","attributes":{"named":{},"numeric":[]}}],"link":"/quest/17429/secret-life-of-a-raindrop","authors":["209"],"categories":["quest_5","quest_6","quest_11","quest_3422","quest_3233","quest_11766"],"tags":["quest_13385","quest_886","quest_3351","quest_2349","quest_3021","quest_3071","quest_3108","quest_3121"],"collections":["quest_12824"],"featImg":"quest_81285","label":"quest_12824"},"quest_73824":{"type":"posts","id":"quest_73824","meta":{"index":"posts_1591205157","site":"quest","id":"73824","score":null,"sort":[1424376011000]},"guestAuthors":[],"slug":"what-happens-when-wood-burns","title":"Science Spotlight: The Combustion of Wood","publishDate":1424376011,"format":"video","headTitle":"QUEST | KQED Science","labelTerm":{},"content":"\u003cp>Having trouble viewing the video? Stream or download it on \u003ca href=\"http://www.pbslearningmedia.org/resource/610dd6de-ac50-4be7-9af4-65aac2270180/the-combustion-of-wood/\"> PBS LearningMedia\u003c/a>\u003c/p>\n\u003cp>Combustion, which is simply the burning of something, is a rather complex chemical process. We rely quite heavily on combustion technologies for energy. For example, we burn gasoline to power our cars; we often burn oil or gas in home heating systems; and power plants usually burn coal, oil or natural gas to generate electricity.\u003c/p>\n\u003cp>Many families, particularly in the developing world, burn wood and other biomass to cook food and heat their homes. However, burning wood and other solid fuels produces a lot of smoke, which is harmful to health and the environment. In fact, the \u003ca href=\"http://www.who.int/indoorair/en/\">World Health Organization\u003c/a> reports that approximately 4 million people die every year from diseases related to smoke inhalation from burning wood and other solid fuels in their homes for cooking and heating. Many of these deaths are young children.\u003c/p>\n\u003cp>Why does burning wood create so much pollution? The short answer is incomplete combustion.\u003c/p>\n\u003cp>In order to get something to burn you need three things, all in the proper combination: fuel (such as wood, oil or gas), oxygen and heat. These requirements are referred to as the “combustion triangle.” With solid fuels, like wood and other biomass, it’s really difficult to get good mixing of the fuel, oxygen and heat in the proper ratio. For example, wood fires, especially those on the ground, don’t receive enough oxygen for the wood to burn completely. Similarly cool breezes can reduce the heat needed to sustain a flame. As a result, you are often left with unburned fuel, particulates, ash, carbon monoxide and nitrogen oxides. These types of compounds are what make up smoke.\u003c/p>\n\u003cp>[ad fullwidth]\u003c/p>\n\u003cp>Watch the animation above to learn more about the chemistry of combustion.\u003c/p>\n\u003cp>This Science Spotlight video is part of our \u003ca href=\"http://learning.kqed.org/ebook/cookstoves/\" target=\"_blank\">Engineering Is: Saving the World with Cookstoves\u003c/a> e-book, and is a companion to our \u003ca href=\"http://ww2.kqed.org/quest/video/darfur-stoves-project/\">Darfur Stoves Project\u003c/a> video. The e-book tells the story of how Professor Ashok Gadgil and his team at Lawrence Berkeley National Laboratory designed a cookstove to help internally displaced persons in Darfur. They are now working on designing a new wood-burning stove to reduce indoor air pollution. The e-book includes videos, interactives and media making opportunities that explore the science and engineering principles behind this project.\u003c/p>\n\u003cp>\u003c/p>\n\u003cp> \u003c/p>\n\n","blocks":[],"excerpt":"What happens when wood burns? In this animated explainer, learn about the chemistry of combustion.","status":"publish","parent":0,"modified":1442619897,"stats":{"hasAudio":false,"hasVideo":false,"hasChartOrMap":false,"iframeSrcs":[],"hasGoogleForm":false,"hasGallery":false,"hasHearkenModule":false,"hasPolis":false,"paragraphCount":9,"wordCount":397},"headData":{"title":"Science Spotlight: The Combustion of Wood | KQED","description":"What happens when wood burns? In this animated explainer, learn about the chemistry of combustion.","ogTitle":"","ogDescription":"","ogImgId":"","twTitle":"","twDescription":"","twImgId":""},"disqusIdentifier":"73824 http://science.kqed.org/quest/?p=73824","disqusUrl":"https://ww2.kqed.org/quest/2015/02/19/what-happens-when-wood-burns/","disqusTitle":"Science Spotlight: The Combustion of Wood","videoEmbed":"https://www.youtube.com/watch?v=B0E4PX3e3RE","source":"Chemistry","sourceUrl":"https://ww2.kqed.org/quest/category/chemistry/","path":"/quest/73824/what-happens-when-wood-burns","audioTrackLength":null,"parsedContent":[{"type":"contentString","content":"\u003cdiv class=\"post-body\">\u003cp>\u003cp>Having trouble viewing the video? Stream or download it on \u003ca href=\"http://www.pbslearningmedia.org/resource/610dd6de-ac50-4be7-9af4-65aac2270180/the-combustion-of-wood/\"> PBS LearningMedia\u003c/a>\u003c/p>\n\u003cp>Combustion, which is simply the burning of something, is a rather complex chemical process. We rely quite heavily on combustion technologies for energy. For example, we burn gasoline to power our cars; we often burn oil or gas in home heating systems; and power plants usually burn coal, oil or natural gas to generate electricity.\u003c/p>\n\u003cp>Many families, particularly in the developing world, burn wood and other biomass to cook food and heat their homes. However, burning wood and other solid fuels produces a lot of smoke, which is harmful to health and the environment. In fact, the \u003ca href=\"http://www.who.int/indoorair/en/\">World Health Organization\u003c/a> reports that approximately 4 million people die every year from diseases related to smoke inhalation from burning wood and other solid fuels in their homes for cooking and heating. Many of these deaths are young children.\u003c/p>\n\u003cp>Why does burning wood create so much pollution? The short answer is incomplete combustion.\u003c/p>\n\u003cp>In order to get something to burn you need three things, all in the proper combination: fuel (such as wood, oil or gas), oxygen and heat. These requirements are referred to as the “combustion triangle.” With solid fuels, like wood and other biomass, it’s really difficult to get good mixing of the fuel, oxygen and heat in the proper ratio. For example, wood fires, especially those on the ground, don’t receive enough oxygen for the wood to burn completely. Similarly cool breezes can reduce the heat needed to sustain a flame. As a result, you are often left with unburned fuel, particulates, ash, carbon monoxide and nitrogen oxides. These types of compounds are what make up smoke.\u003c/p>\n\u003cp>\u003c/p>\u003c/div>","attributes":{"named":{},"numeric":[]}},{"type":"component","content":"","name":"ad","attributes":{"named":{"label":"fullwidth"},"numeric":["fullwidth"]}},{"type":"contentString","content":"\u003cdiv class=\"post-body\">\u003cp>\u003c/p>\n\u003cp>Watch the animation above to learn more about the chemistry of combustion.\u003c/p>\n\u003cp>This Science Spotlight video is part of our \u003ca href=\"http://learning.kqed.org/ebook/cookstoves/\" target=\"_blank\">Engineering Is: Saving the World with Cookstoves\u003c/a> e-book, and is a companion to our \u003ca href=\"http://ww2.kqed.org/quest/video/darfur-stoves-project/\">Darfur Stoves Project\u003c/a> video. The e-book tells the story of how Professor Ashok Gadgil and his team at Lawrence Berkeley National Laboratory designed a cookstove to help internally displaced persons in Darfur. They are now working on designing a new wood-burning stove to reduce indoor air pollution. The e-book includes videos, interactives and media making opportunities that explore the science and engineering principles behind this project.\u003c/p>\n\u003cp>\u003c/p>\n\u003cp> \u003c/p>\n\n\u003c/div>\u003c/p>","attributes":{"named":{},"numeric":[]}}],"link":"/quest/73824/what-happens-when-wood-burns","authors":["6544"],"categories":["quest_5","quest_11765","quest_8"],"tags":["quest_413","quest_13133","quest_10220","quest_12946","quest_12269","quest_13131","quest_3351","quest_2141","quest_2349","quest_13132","quest_3071","quest_12046"],"collections":["quest_13134"],"featImg":"quest_73828","label":"source_quest_73824"},"quest_73097":{"type":"posts","id":"quest_73097","meta":{"index":"posts_1591205157","site":"quest","id":"73097","score":null,"sort":[1418419148000]},"guestAuthors":[],"slug":"what-are-greenhouse-gases-and-where-do-they-come-from","title":"What Are Greenhouse Gases and Where Do They Come From?","publishDate":1418419148,"format":"video","headTitle":"QUEST | KQED Science","labelTerm":{"term":13355,"site":"quest"},"content":"\u003cp>Climate change is primarily caused by the accumulation of greenhouse gases, or heat-trapping gases, in the atmosphere. Greenhouse gases are certain molecules in the air that have the ability to trap heat in the Earth's atmosphere. Some greenhouse gases, like carbon dioxide (CO\u003csub>2\u003c/sub>) and methane (CH\u003csub>4\u003c/sub>), occur naturally and play an important role in Earth's climate. If they didn't exist, the planet would be a much colder place. However, some human activities, such as mining and burning fossil fuels (like coal, oil and natural gas) for energy and transportation, emit molecules of CO\u003csub>2\u003c/sub> and other greenhouse gases. These activities cause greenhouse gases to accumulate in the air, and as these molecules build up in the atmosphere they cause an overall warming of the planet. Some greenhouse gases are entirely man-made and are products of certain industrial processes.\u003c/p>\n\u003cp>\u003ciframe title=\"Sources of Greenhouse Gases\" width=\"640\" height=\"480\" src=\"https://www.youtube.com/embed/qxWNbHHcPRQ?feature=oembed\" frameborder=\"0\" allow=\"accelerometer; autoplay; encrypted-media; gyroscope; picture-in-picture\" allowfullscreen>\u003c/iframe>\u003c/p>\n\u003cp>\u003cspan style=\"color: #444444\">\u003cem>Play the video to see sources of the main greenhouse gases.\u003c/em>\u003c/span>\u003c/p>\n\u003cp>Not all greenhouse gases are created equal in terms of contributing to climate change. Their impact varies according to how long they remain in the atmosphere and how efficient they are at trapping heat. For example, methane, the main component in natural gas, remains in the atmosphere for a shorter time than CO\u003csub>2\u003c/sub>, but is far more efficient at trapping heat, making it a more potent greenhouse gas. Nitrous oxide is less abundant than methane, but even more efficient at trapping heat, and it stays in the atmosphere for a long time. Understanding the impacts and sources of the main greenhouse gases can help inform strategies to reduce greenhouse gas emissions.\u003c/p>\n\u003cp>For more information, check out the \u003ca href=\"http://www.epa.gov/climatechange/ghgemissions/\">EPA's resources on greenhouse gases.\u003c/a>\u003c/p>\n\u003ch2>Discussion Questions\u003c/h2>\n\u003cul>\n\u003cli>What does the term \"greenhouse gas\" mean?\u003c/li>\n\u003cli>What role do greenhouse gases play in climate change?\u003c/li>\n\u003cli>What is the most prevalent greenhouse gas?\u003c/li>\n\u003cli>What are some of the major sources of greenhouse gases?\u003c/li>\n\u003cli>Which greenhouse gases do you think are of greatest concern in terms of global warming? Why?\u003c/li>\n\u003c/ul>\n\u003cp>This video explainer is part of our \u003ca href=\"https://ww2.kqed.org/quest/collections/clue-into-climate/\">Clue into Climate\u003c/a> collection of resources.\u003c/p>\n\u003chr>\n\u003cp>\u003cstrong>This video explainer is featured in our \u003cstrong>Clue into Climate\u003c/strong> e-book series. Click on the tabs below to download our free e-books and subscribe to our iTunes U course. You can also visit our \u003ca href=\"http://blogs.kqed.org/education/e-books/\">e-books page\u003c/a> to view our other offerings.\u003c/strong>\u003c/p>\n\u003cdiv class=\"clearfix\">\n\u003cp>\u003cimg class=\"alignleft size-full wp-image-11944\" src=\"http://ww2.kqed.org/quest/wp-content/uploads/sites/39/2015/12/Climate-e-book-cover-1-150x194.png\" alt=\"Climate e-book cover 1\" width=\"105\" height=\"136\">\u003c/p>\n\u003cp>Look into the causes of climate change, and discover how scientists develop and use climate models.\u003c/p>\n\u003cp>\u003ca href=\"https://itunes.apple.com/ee/book/clue-into-climate-causes-change/id927517681?mt=13\">\u003cimg class=\"wp-image-11945\" src=\"http://ww2.kqed.org/quest/wp-content/uploads/sites/39/2015/12/Download_on_iTunes_Badge_US-UK_110x40_1004.png\" alt=\"Download on iBooks\" width=\"110\" height=\"40\">\u003c/a> \u003ca href=\"https://itunes.apple.com/us/course/clue-into-climate/id944516910\">\u003cimg alt=\"\">\u003c/a>\u003ca href=\"https://itunes.apple.com/us/course/clue-into-climate/id944516910\">\u003cimg src=\"http://ww2.kqed.org/quest/wp-content/uploads/sites/39/2015/12/E-book-button-for-Web.png\" alt=\"Subscribe on iTunes\" width=\"110\" height=\"40\">\u003c/a>\u003c/p>\n\u003c/div>\n\u003cdiv class=\"clearfix\">\n\u003cp>\u003cimg class=\"alignleft size-full wp-image-14724\" src=\"http://ww2.kqed.org/quest/wp-content/uploads/sites/39/2015/12/Climate-e-book-cover-2-150x194.png\" alt=\"Climate e-book cover 2 web\" width=\"105\" height=\"136\">\u003c/p>\n\u003cp>Learn about how climate change influences precipitation patterns and how it impacts our frozen landscape.\u003c/p>\n\u003cp>\u003ca href=\"https://itunes.apple.com/us/book/clue-into-climate-changing/id930719116?mt=13\">\u003cimg class=\"wp-image-11945\" src=\"http://ww2.kqed.org/quest/wp-content/uploads/sites/39/2015/12/Download_on_iTunes_Badge_US-UK_110x40_1004.png\" alt=\"Download on iBooks\" width=\"110\" height=\"40\">\u003c/a> \u003ca href=\"https://itunes.apple.com/us/course/clue-into-climate/id944516910\">\u003cimg alt=\"\">\u003c/a>\u003ca href=\"https://itunes.apple.com/us/course/clue-into-climate/id944516910\">\u003cimg src=\"http://ww2.kqed.org/quest/wp-content/uploads/sites/39/2015/12/E-book-button-for-Web.png\" alt=\"Subscribe on iTunes\" width=\"110\" height=\"40\">\u003c/a>\u003c/p>\n\u003c/div>\n\u003cdiv class=\"clearfix\">\n\u003cp>\u003cimg class=\"alignleft size-full wp-image-14735\" src=\"http://ww2.kqed.org/quest/wp-content/uploads/sites/39/2015/12/Climate-e-book-cover-3-150x194.png\" alt=\"Climate e-book cover 3 updated web\" width=\"105\" height=\"136\">\u003c/p>\n\u003cp>Investigate shifts in the distribution of plant and animal species due to climate change, and the effects of increased carbon dioxide emissions on the ocean.\u003c/p>\n\u003cp>\u003ca href=\"https://itunes.apple.com/us/book/clue-into-climate-changing/id932195900?mt=13\">\u003cimg class=\"wp-image-11945\" src=\"http://ww2.kqed.org/quest/wp-content/uploads/sites/39/2015/12/Download_on_iTunes_Badge_US-UK_110x40_1004.png\" alt=\"Download on iBooks\" width=\"110\" height=\"40\">\u003c/a> \u003ca href=\"https://itunes.apple.com/us/course/clue-into-climate/id944516910\">\u003cimg alt=\"\">\u003c/a>\u003ca href=\"https://itunes.apple.com/us/course/clue-into-climate/id944516910\">\u003cimg src=\"http://ww2.kqed.org/quest/wp-content/uploads/sites/39/2015/12/E-book-button-for-Web.png\" alt=\"Subscribe on iTunes\" width=\"110\" height=\"40\">\u003c/a>\u003c/p>\n\u003c/div>\n\u003cdiv class=\"clearfix\">\n\u003cp>\u003cimg class=\"alignleft size-full wp-image-14737\" src=\"http://ww2.kqed.org/quest/wp-content/uploads/sites/39/2015/12/Climate-e-book-cover-4-150x194.png\" alt=\"Climate e-book cover 4 web\" width=\"105\" height=\"136\">\u003c/p>\n\u003cp>See how communities are preparing for sea level rise and other impacts of climate change, and ways we can help minimize future climate change.\u003c/p>\n\u003cp>\u003ca href=\"https://itunes.apple.com/us/book/clue-into-climate-facing-our/id932658240?mt=13\">\u003cimg class=\"wp-image-11945\" src=\"http://ww2.kqed.org/quest/wp-content/uploads/sites/39/2015/12/Download_on_iTunes_Badge_US-UK_110x40_1004.png\" alt=\"Download on iBooks\" width=\"110\" height=\"40\">\u003c/a> \u003ca href=\"https://itunes.apple.com/us/course/clue-into-climate/id944516910\">\u003cimg alt=\"\">\u003c/a>\u003ca href=\"https://itunes.apple.com/us/course/clue-into-climate/id944516910\">\u003cimg src=\"http://ww2.kqed.org/quest/wp-content/uploads/sites/39/2015/12/E-book-button-for-Web.png\" alt=\"Subscribe on iTunes\" width=\"110\" height=\"40\">\u003c/a>\u003c/p>\n\u003c/div>\n\u003cdiv class=\"clearfix\">\u003c/div>\n\u003cp>[ad fullwidth]\u003c/p>\u003cp>\u003c/p>\n","blocks":[],"excerpt":"Explore different types of greenhouse gas, from carbon dioxide to fluorinated gas, in this interactive graphic.","status":"publish","parent":0,"modified":1587419173,"stats":{"hasAudio":false,"hasVideo":true,"hasChartOrMap":true,"iframeSrcs":["https://www.youtube.com/embed/qxWNbHHcPRQ"],"hasGoogleForm":false,"hasGallery":false,"hasHearkenModule":false,"hasPolis":false,"paragraphCount":21,"wordCount":466},"headData":{"title":"What Are Greenhouse Gases and Where Do They Come From? | KQED","description":"Explore different types of greenhouse gas, from carbon dioxide to fluorinated gas, in this interactive graphic.","ogTitle":"","ogDescription":"","ogImgId":"","twTitle":"","twDescription":"","twImgId":""},"disqusIdentifier":"73097 http://science.kqed.org/quest/?p=73097","disqusUrl":"https://ww2.kqed.org/quest/2014/12/12/what-are-greenhouse-gases-and-where-do-they-come-from/","disqusTitle":"What Are Greenhouse Gases and Where Do They Come From?","path":"/quest/73097/what-are-greenhouse-gases-and-where-do-they-come-from","audioTrackLength":null,"parsedContent":[{"type":"contentString","content":"\u003cdiv class=\"post-body\">\u003cp>\u003cp>Climate change is primarily caused by the accumulation of greenhouse gases, or heat-trapping gases, in the atmosphere. Greenhouse gases are certain molecules in the air that have the ability to trap heat in the Earth's atmosphere. Some greenhouse gases, like carbon dioxide (CO\u003csub>2\u003c/sub>) and methane (CH\u003csub>4\u003c/sub>), occur naturally and play an important role in Earth's climate. If they didn't exist, the planet would be a much colder place. However, some human activities, such as mining and burning fossil fuels (like coal, oil and natural gas) for energy and transportation, emit molecules of CO\u003csub>2\u003c/sub> and other greenhouse gases. These activities cause greenhouse gases to accumulate in the air, and as these molecules build up in the atmosphere they cause an overall warming of the planet. Some greenhouse gases are entirely man-made and are products of certain industrial processes.\u003c/p>\n\u003cp>\u003ciframe title=\"Sources of Greenhouse Gases\" width=\"640\" height=\"480\" src=\"https://www.youtube.com/embed/qxWNbHHcPRQ?feature=oembed\" frameborder=\"0\" allow=\"accelerometer; autoplay; encrypted-media; gyroscope; picture-in-picture\" allowfullscreen>\u003c/iframe>\u003c/p>\n\u003cp>\u003cspan style=\"color: #444444\">\u003cem>Play the video to see sources of the main greenhouse gases.\u003c/em>\u003c/span>\u003c/p>\n\u003cp>Not all greenhouse gases are created equal in terms of contributing to climate change. Their impact varies according to how long they remain in the atmosphere and how efficient they are at trapping heat. For example, methane, the main component in natural gas, remains in the atmosphere for a shorter time than CO\u003csub>2\u003c/sub>, but is far more efficient at trapping heat, making it a more potent greenhouse gas. Nitrous oxide is less abundant than methane, but even more efficient at trapping heat, and it stays in the atmosphere for a long time. Understanding the impacts and sources of the main greenhouse gases can help inform strategies to reduce greenhouse gas emissions.\u003c/p>\n\u003cp>For more information, check out the \u003ca href=\"http://www.epa.gov/climatechange/ghgemissions/\">EPA's resources on greenhouse gases.\u003c/a>\u003c/p>\n\u003ch2>Discussion Questions\u003c/h2>\n\u003cul>\n\u003cli>What does the term \"greenhouse gas\" mean?\u003c/li>\n\u003cli>What role do greenhouse gases play in climate change?\u003c/li>\n\u003cli>What is the most prevalent greenhouse gas?\u003c/li>\n\u003cli>What are some of the major sources of greenhouse gases?\u003c/li>\n\u003cli>Which greenhouse gases do you think are of greatest concern in terms of global warming? Why?\u003c/li>\n\u003c/ul>\n\u003cp>This video explainer is part of our \u003ca href=\"https://ww2.kqed.org/quest/collections/clue-into-climate/\">Clue into Climate\u003c/a> collection of resources.\u003c/p>\n\u003chr>\n\u003cp>\u003cstrong>This video explainer is featured in our \u003cstrong>Clue into Climate\u003c/strong> e-book series. Click on the tabs below to download our free e-books and subscribe to our iTunes U course. You can also visit our \u003ca href=\"http://blogs.kqed.org/education/e-books/\">e-books page\u003c/a> to view our other offerings.\u003c/strong>\u003c/p>\n\u003cdiv class=\"clearfix\">\n\u003cp>\u003cimg class=\"alignleft size-full wp-image-11944\" src=\"http://ww2.kqed.org/quest/wp-content/uploads/sites/39/2015/12/Climate-e-book-cover-1-150x194.png\" alt=\"Climate e-book cover 1\" width=\"105\" height=\"136\">\u003c/p>\n\u003cp>Look into the causes of climate change, and discover how scientists develop and use climate models.\u003c/p>\n\u003cp>\u003ca href=\"https://itunes.apple.com/ee/book/clue-into-climate-causes-change/id927517681?mt=13\">\u003cimg class=\"wp-image-11945\" src=\"http://ww2.kqed.org/quest/wp-content/uploads/sites/39/2015/12/Download_on_iTunes_Badge_US-UK_110x40_1004.png\" alt=\"Download on iBooks\" width=\"110\" height=\"40\">\u003c/a> \u003ca href=\"https://itunes.apple.com/us/course/clue-into-climate/id944516910\">\u003cimg alt=\"\">\u003c/a>\u003ca href=\"https://itunes.apple.com/us/course/clue-into-climate/id944516910\">\u003cimg src=\"http://ww2.kqed.org/quest/wp-content/uploads/sites/39/2015/12/E-book-button-for-Web.png\" alt=\"Subscribe on iTunes\" width=\"110\" height=\"40\">\u003c/a>\u003c/p>\n\u003c/div>\n\u003cdiv class=\"clearfix\">\n\u003cp>\u003cimg class=\"alignleft size-full wp-image-14724\" src=\"http://ww2.kqed.org/quest/wp-content/uploads/sites/39/2015/12/Climate-e-book-cover-2-150x194.png\" alt=\"Climate e-book cover 2 web\" width=\"105\" height=\"136\">\u003c/p>\n\u003cp>Learn about how climate change influences precipitation patterns and how it impacts our frozen landscape.\u003c/p>\n\u003cp>\u003ca href=\"https://itunes.apple.com/us/book/clue-into-climate-changing/id930719116?mt=13\">\u003cimg class=\"wp-image-11945\" src=\"http://ww2.kqed.org/quest/wp-content/uploads/sites/39/2015/12/Download_on_iTunes_Badge_US-UK_110x40_1004.png\" alt=\"Download on iBooks\" width=\"110\" height=\"40\">\u003c/a> \u003ca href=\"https://itunes.apple.com/us/course/clue-into-climate/id944516910\">\u003cimg alt=\"\">\u003c/a>\u003ca href=\"https://itunes.apple.com/us/course/clue-into-climate/id944516910\">\u003cimg src=\"http://ww2.kqed.org/quest/wp-content/uploads/sites/39/2015/12/E-book-button-for-Web.png\" alt=\"Subscribe on iTunes\" width=\"110\" height=\"40\">\u003c/a>\u003c/p>\n\u003c/div>\n\u003cdiv class=\"clearfix\">\n\u003cp>\u003cimg class=\"alignleft size-full wp-image-14735\" src=\"http://ww2.kqed.org/quest/wp-content/uploads/sites/39/2015/12/Climate-e-book-cover-3-150x194.png\" alt=\"Climate e-book cover 3 updated web\" width=\"105\" height=\"136\">\u003c/p>\n\u003cp>Investigate shifts in the distribution of plant and animal species due to climate change, and the effects of increased carbon dioxide emissions on the ocean.\u003c/p>\n\u003cp>\u003ca href=\"https://itunes.apple.com/us/book/clue-into-climate-changing/id932195900?mt=13\">\u003cimg class=\"wp-image-11945\" src=\"http://ww2.kqed.org/quest/wp-content/uploads/sites/39/2015/12/Download_on_iTunes_Badge_US-UK_110x40_1004.png\" alt=\"Download on iBooks\" width=\"110\" height=\"40\">\u003c/a> \u003ca href=\"https://itunes.apple.com/us/course/clue-into-climate/id944516910\">\u003cimg alt=\"\">\u003c/a>\u003ca href=\"https://itunes.apple.com/us/course/clue-into-climate/id944516910\">\u003cimg src=\"http://ww2.kqed.org/quest/wp-content/uploads/sites/39/2015/12/E-book-button-for-Web.png\" alt=\"Subscribe on iTunes\" width=\"110\" height=\"40\">\u003c/a>\u003c/p>\n\u003c/div>\n\u003cdiv class=\"clearfix\">\n\u003cp>\u003cimg class=\"alignleft size-full wp-image-14737\" src=\"http://ww2.kqed.org/quest/wp-content/uploads/sites/39/2015/12/Climate-e-book-cover-4-150x194.png\" alt=\"Climate e-book cover 4 web\" width=\"105\" height=\"136\">\u003c/p>\n\u003cp>See how communities are preparing for sea level rise and other impacts of climate change, and ways we can help minimize future climate change.\u003c/p>\n\u003cp>\u003ca href=\"https://itunes.apple.com/us/book/clue-into-climate-facing-our/id932658240?mt=13\">\u003cimg class=\"wp-image-11945\" src=\"http://ww2.kqed.org/quest/wp-content/uploads/sites/39/2015/12/Download_on_iTunes_Badge_US-UK_110x40_1004.png\" alt=\"Download on iBooks\" width=\"110\" height=\"40\">\u003c/a> \u003ca href=\"https://itunes.apple.com/us/course/clue-into-climate/id944516910\">\u003cimg alt=\"\">\u003c/a>\u003ca href=\"https://itunes.apple.com/us/course/clue-into-climate/id944516910\">\u003cimg src=\"http://ww2.kqed.org/quest/wp-content/uploads/sites/39/2015/12/E-book-button-for-Web.png\" alt=\"Subscribe on iTunes\" width=\"110\" height=\"40\">\u003c/a>\u003c/p>\n\u003c/div>\n\u003cdiv class=\"clearfix\">\u003c/div>\n\u003cp>\u003c/p>\u003c/div>","attributes":{"named":{},"numeric":[]}},{"type":"component","content":"","name":"ad","attributes":{"named":{"label":"fullwidth"},"numeric":["fullwidth"]}},{"type":"contentString","content":"\u003cdiv class=\"post-body\">\u003cp>\u003c/p>\u003cp>\u003c/p>\n\u003c/div>\u003c/p>","attributes":{"named":{},"numeric":[]}}],"link":"/quest/73097/what-are-greenhouse-gases-and-where-do-they-come-from","authors":["10216"],"categories":["quest_5","quest_6","quest_9"],"tags":["quest_621","quest_13098","quest_12946","quest_1271","quest_1272","quest_11194","quest_1585"],"collections":["quest_13355"],"featImg":"quest_73405","label":"quest_13355"},"quest_73187":{"type":"posts","id":"quest_73187","meta":{"index":"posts_1591205157","site":"quest","id":"73187","score":null,"sort":[1418419098000]},"guestAuthors":[],"slug":"the-keeling-curve-explained","title":"The Keeling Curve Explained","publishDate":1418419098,"format":"aside","headTitle":"QUEST | KQED Science","labelTerm":{"term":13355,"site":"quest"},"content":"\u003cp>The Keeling Curve is one of the most compelling pieces of scientific evidence that shows that carbon dioxide (CO\u003csub>2\u003c/sub>) is accumulating in our atmosphere. CO\u003csub>2\u003c/sub> is a greenhouse gas. Greenhouse gases trap heat in the atmosphere and help keep the planet warm. More greenhouse gas molecules in the air means more heat is trapped, leading to an overall warming of the planet.\u003c/p>\n\u003cp>\u003ciframe title=\"The Keeling Curve Explained\" width=\"640\" height=\"480\" src=\"https://www.youtube.com/embed/H5gwH9r7FjQ?feature=oembed\" frameborder=\"0\" allow=\"accelerometer; autoplay; encrypted-media; gyroscope; picture-in-picture\" allowfullscreen>\u003c/iframe>\u003c/p>\n\u003cp>\u003cem>Read the explanations in the video above to learn more about the Keeling Curve, which plots CO\u003csub>2 \u003c/sub>in the Earth’s atmosphere over time.\u003c/em>\u003c/p>\n\u003cp>CO\u003csub>2 \u003c/sub>is a molecule made up of one carbon atom and two oxygen atoms, and it moves in and out of the atmosphere through various process known as the carbon cycle. In the carbon cycle, natural processes like human respiration and volcanic activity release CO\u003csub>2\u003c/sub>. Plants absorb CO\u003csub>2\u003c/sub> during photosynthesis and the ocean absorbs it when CO\u003csub>2\u003c/sub> from the air mixes with seawater. However, human activities, such as the burning of fossil fuels, like coal, oil and natural gas, also release CO\u003csub>2\u003c/sub> into the atmosphere.\u003c/p>\n\u003cp>Since the start of the Industrial Revolution in the late 1700s, humans have been emitting more and more CO\u003csub>2\u003c/sub>. At the same time, forests all over the world are being cleared for agriculture and development. Deforestation not only leaves fewer plants to absorb the increasing amounts of CO\u003csub>2\u003c/sub>, but also adds CO\u003csub>2\u003c/sub> to the air when trees are burned or left to decay.\u003c/p>\n\u003cp>[ad fullwidth]\u003c/p>\n\u003cp>Until about the mid-20\u003csup>th\u003c/sup> century many scientists thought that the oceans would easily absorb the excess CO\u003csub>2\u003c/sub> emitted from fossil fuel burning, so there wasn't a great concern over the possible effects of increased emissions in the atmosphere. However, there wasn't a lot of data on the actual concentrations of CO\u003csub>2\u003c/sub> in the atmosphere. In 1958, Charles Keeling of the Scripps Institute of Oceanography began measuring CO\u003csub>2\u003c/sub> levels in the air at a weather station in Hawaii and at the South Pole. After a few years, Keeling observed a steady increase in atmospheric CO\u003csub>2\u003c/sub>, an indication that fossil-fuel emissions were building up in the atmosphere. Due to funding cuts, Keeling had to stop measurements at the South Pole, but the weather station in Hawaii continues to measure concentrations of CO\u003csub>2\u003c/sub>. The data from these measurements are plotted on a graph known as the Keeling Curve.\u003c/p>\n\u003cp>Keeling's findings were so profound that they prompted the National Oceanic and Atmospheric Administration (NOAA) to start monitoring CO\u003csub>2\u003c/sub> concentrations in other locations around the world. And, in July 2014, NASA launched the Orbiting Carbon Observatory, a satellite designed to gather the most precise data ever for tracking the carbon cycle on Earth. All of this data indicates that CO\u003csub>2\u003c/sub> is building up in Earth's atmosphere.\u003c/p>\n\u003ch2>Discussion Questions\u003c/h2>\n\u003cul>\n\u003cli>What does the Keeling Curve show about the concentrations of CO\u003csub>2\u003c/sub> in the Earth's atmosphere?\u003c/li>\n\u003cli>Why does the concentration of CO\u003csub>2\u003c/sub> go up and down throughout the year?\u003c/li>\n\u003cli>Why do you think Keeling chose Mauna Loa and Antarctica to measure atmospheric CO\u003csub>2\u003c/sub>?\u003c/li>\n\u003cli>Why does the concentration of CO\u003csub>2\u003c/sub> increase over time?\u003c/li>\n\u003cli>What does an increase in CO\u003csub>2\u003c/sub> levels in the atmosphere mean for global warming?\u003c/li>\n\u003c/ul>\n\u003cp>This video explainer is part of our \u003ca href=\"https://ww2.kqed.org/quest/collections/clue-into-climate/\">Clue into Climate\u003c/a> collection of resources.\u003c/p>\n\u003chr>\n\u003cp>\u003c/p>\n\u003cp>\u003cstrong>An interactive version of this explainer is featured in our \u003cstrong>Clue into Climate\u003c/strong> e-book series. Click on the tabs below to download our free e-books or subscribe to our iTunes U course. You can also visit our \u003ca href=\"http://blogs.kqed.org/education/e-books/\">e-books page\u003c/a> to view our other offerings.\u003c/strong>\u003c/p>\n\u003cdiv class=\"clearfix\">\n\u003cp>\u003cimg class=\"alignleft size-full wp-image-11944\" src=\"http://ww2.kqed.org/quest/wp-content/uploads/sites/39/2015/12/Climate-e-book-cover-1-150x194.png\" alt=\"Climate e-book cover 1\" width=\"105\" height=\"136\">\u003c/p>\n\u003cp>Look into the causes of climate change, and discover how scientists develop and use climate models.\u003c/p>\n\u003cp>\u003ca href=\"https://itunes.apple.com/ee/book/clue-into-climate-causes-change/id927517681?mt=13\">\u003cimg class=\"wp-image-11945\" src=\"http://ww2.kqed.org/quest/wp-content/uploads/sites/39/2015/12/Download_on_iTunes_Badge_US-UK_110x40_1004.png\" alt=\"Download on iBooks\" width=\"110\" height=\"40\">\u003c/a> \u003ca href=\"https://itunes.apple.com/us/course/clue-into-climate/id944516910\">\u003cimg alt=\"\">\u003c/a>\u003ca href=\"https://itunes.apple.com/us/course/clue-into-climate/id944516910\">\u003cimg src=\"http://ww2.kqed.org/quest/wp-content/uploads/sites/39/2015/12/E-book-button-for-Web.png\" alt=\"Subscribe on iTunes\" width=\"110\" height=\"40\">\u003c/a>\u003c/p>\n\u003c/div>\n\u003cdiv class=\"clearfix\">\n\u003cp>\u003cimg class=\"alignleft size-full wp-image-14724\" src=\"http://ww2.kqed.org/quest/wp-content/uploads/sites/39/2015/12/Climate-e-book-cover-2-150x194.png\" alt=\"Climate e-book cover 2 web\" width=\"105\" height=\"136\">\u003c/p>\n\u003cp>Learn about how climate change influences precipitation patterns and how it impacts our frozen landscape.\u003c/p>\n\u003cp>\u003ca href=\"https://itunes.apple.com/us/book/clue-into-climate-changing/id930719116?mt=13\">\u003cimg class=\"wp-image-11945\" src=\"http://ww2.kqed.org/quest/wp-content/uploads/sites/39/2015/12/Download_on_iTunes_Badge_US-UK_110x40_1004.png\" alt=\"Download on iBooks\" width=\"110\" height=\"40\">\u003c/a> \u003ca href=\"https://itunes.apple.com/us/course/clue-into-climate/id944516910\">\u003cimg alt=\"\">\u003c/a>\u003ca href=\"https://itunes.apple.com/us/course/clue-into-climate/id944516910\">\u003cimg src=\"http://ww2.kqed.org/quest/wp-content/uploads/sites/39/2015/12/E-book-button-for-Web.png\" alt=\"Subscribe on iTunes\" width=\"110\" height=\"40\">\u003c/a>\u003c/p>\n\u003c/div>\n\u003cdiv class=\"clearfix\">\n\u003cp>\u003cimg class=\"alignleft size-full wp-image-14735\" src=\"http://ww2.kqed.org/quest/wp-content/uploads/sites/39/2015/12/Climate-e-book-cover-3-150x194.png\" alt=\"Climate e-book cover 3 updated web\" width=\"105\" height=\"136\">\u003c/p>\n\u003cp>Investigate shifts in the distribution of plant and animal species due to climate change, and the effects of increased carbon dioxide emissions on the ocean.\u003c/p>\n\u003cp>\u003ca href=\"https://itunes.apple.com/us/book/clue-into-climate-changing/id932195900?mt=13\">\u003cimg class=\"wp-image-11945\" src=\"http://ww2.kqed.org/quest/wp-content/uploads/sites/39/2015/12/Download_on_iTunes_Badge_US-UK_110x40_1004.png\" alt=\"Download on iBooks\" width=\"110\" height=\"40\">\u003c/a> \u003ca href=\"https://itunes.apple.com/us/course/clue-into-climate/id944516910\">\u003cimg alt=\"\">\u003c/a>\u003ca href=\"https://itunes.apple.com/us/course/clue-into-climate/id944516910\">\u003cimg src=\"http://ww2.kqed.org/quest/wp-content/uploads/sites/39/2015/12/E-book-button-for-Web.png\" alt=\"Subscribe on iTunes\" width=\"110\" height=\"40\">\u003c/a>\u003c/p>\n\u003c/div>\n\u003cdiv class=\"clearfix\">\n\u003cp>\u003cimg class=\"alignleft size-full wp-image-14737\" src=\"http://ww2.kqed.org/quest/wp-content/uploads/sites/39/2015/12/Climate-e-book-cover-4-150x194.png\" alt=\"Climate e-book cover 4 web\" width=\"105\" height=\"136\">\u003c/p>\n\u003cp>See how communities are preparing for sea level rise and other impacts of climate change, and ways we can help minimize future climate change.\u003c/p>\n\u003cp>\u003ca href=\"https://itunes.apple.com/us/book/clue-into-climate-facing-our/id932658240?mt=13\">\u003cimg class=\"wp-image-11945\" src=\"http://ww2.kqed.org/quest/wp-content/uploads/sites/39/2015/12/Download_on_iTunes_Badge_US-UK_110x40_1004.png\" alt=\"Download on iBooks\" width=\"110\" height=\"40\">\u003c/a> \u003ca href=\"https://itunes.apple.com/us/course/clue-into-climate/id944516910\">\u003cimg alt=\"\">\u003c/a>\u003ca href=\"https://itunes.apple.com/us/course/clue-into-climate/id944516910\">\u003cimg src=\"http://ww2.kqed.org/quest/wp-content/uploads/sites/39/2015/12/E-book-button-for-Web.png\" alt=\"Subscribe on iTunes\" width=\"110\" height=\"40\">\u003c/a>\u003c/p>\n\u003c/div>\n\u003cdiv class=\"clearfix\">\u003c/div>\n\n","blocks":[],"excerpt":"Explore the Keeling Curve, which has measured CO2 levels in the atmosphere since 1958, in this interactive graphic.","status":"publish","parent":0,"modified":1587659609,"stats":{"hasAudio":false,"hasVideo":true,"hasChartOrMap":true,"iframeSrcs":["https://www.youtube.com/embed/H5gwH9r7FjQ"],"hasGoogleForm":false,"hasGallery":false,"hasHearkenModule":false,"hasPolis":false,"paragraphCount":23,"wordCount":667},"headData":{"title":"The Keeling Curve Explained | KQED","description":"Explore the Keeling Curve, which has measured CO2 levels in the atmosphere since 1958, in this interactive graphic.","ogTitle":"","ogDescription":"","ogImgId":"","twTitle":"","twDescription":"","twImgId":""},"disqusIdentifier":"73187 http://science.kqed.org/quest/?p=73187","disqusUrl":"https://ww2.kqed.org/quest/2014/12/12/the-keeling-curve-explained/","disqusTitle":"The Keeling Curve Explained","path":"/quest/73187/the-keeling-curve-explained","audioTrackLength":null,"parsedContent":[{"type":"contentString","content":"\u003cdiv class=\"post-body\">\u003cp>\u003cp>The Keeling Curve is one of the most compelling pieces of scientific evidence that shows that carbon dioxide (CO\u003csub>2\u003c/sub>) is accumulating in our atmosphere. CO\u003csub>2\u003c/sub> is a greenhouse gas. Greenhouse gases trap heat in the atmosphere and help keep the planet warm. More greenhouse gas molecules in the air means more heat is trapped, leading to an overall warming of the planet.\u003c/p>\n\u003cp>\u003ciframe title=\"The Keeling Curve Explained\" width=\"640\" height=\"480\" src=\"https://www.youtube.com/embed/H5gwH9r7FjQ?feature=oembed\" frameborder=\"0\" allow=\"accelerometer; autoplay; encrypted-media; gyroscope; picture-in-picture\" allowfullscreen>\u003c/iframe>\u003c/p>\n\u003cp>\u003cem>Read the explanations in the video above to learn more about the Keeling Curve, which plots CO\u003csub>2 \u003c/sub>in the Earth’s atmosphere over time.\u003c/em>\u003c/p>\n\u003cp>CO\u003csub>2 \u003c/sub>is a molecule made up of one carbon atom and two oxygen atoms, and it moves in and out of the atmosphere through various process known as the carbon cycle. In the carbon cycle, natural processes like human respiration and volcanic activity release CO\u003csub>2\u003c/sub>. Plants absorb CO\u003csub>2\u003c/sub> during photosynthesis and the ocean absorbs it when CO\u003csub>2\u003c/sub> from the air mixes with seawater. However, human activities, such as the burning of fossil fuels, like coal, oil and natural gas, also release CO\u003csub>2\u003c/sub> into the atmosphere.\u003c/p>\n\u003cp>Since the start of the Industrial Revolution in the late 1700s, humans have been emitting more and more CO\u003csub>2\u003c/sub>. At the same time, forests all over the world are being cleared for agriculture and development. Deforestation not only leaves fewer plants to absorb the increasing amounts of CO\u003csub>2\u003c/sub>, but also adds CO\u003csub>2\u003c/sub> to the air when trees are burned or left to decay.\u003c/p>\n\u003cp>\u003c/p>\u003c/div>","attributes":{"named":{},"numeric":[]}},{"type":"component","content":"","name":"ad","attributes":{"named":{"label":"fullwidth"},"numeric":["fullwidth"]}},{"type":"contentString","content":"\u003cdiv class=\"post-body\">\u003cp>\u003c/p>\n\u003cp>Until about the mid-20\u003csup>th\u003c/sup> century many scientists thought that the oceans would easily absorb the excess CO\u003csub>2\u003c/sub> emitted from fossil fuel burning, so there wasn't a great concern over the possible effects of increased emissions in the atmosphere. However, there wasn't a lot of data on the actual concentrations of CO\u003csub>2\u003c/sub> in the atmosphere. In 1958, Charles Keeling of the Scripps Institute of Oceanography began measuring CO\u003csub>2\u003c/sub> levels in the air at a weather station in Hawaii and at the South Pole. After a few years, Keeling observed a steady increase in atmospheric CO\u003csub>2\u003c/sub>, an indication that fossil-fuel emissions were building up in the atmosphere. Due to funding cuts, Keeling had to stop measurements at the South Pole, but the weather station in Hawaii continues to measure concentrations of CO\u003csub>2\u003c/sub>. The data from these measurements are plotted on a graph known as the Keeling Curve.\u003c/p>\n\u003cp>Keeling's findings were so profound that they prompted the National Oceanic and Atmospheric Administration (NOAA) to start monitoring CO\u003csub>2\u003c/sub> concentrations in other locations around the world. And, in July 2014, NASA launched the Orbiting Carbon Observatory, a satellite designed to gather the most precise data ever for tracking the carbon cycle on Earth. All of this data indicates that CO\u003csub>2\u003c/sub> is building up in Earth's atmosphere.\u003c/p>\n\u003ch2>Discussion Questions\u003c/h2>\n\u003cul>\n\u003cli>What does the Keeling Curve show about the concentrations of CO\u003csub>2\u003c/sub> in the Earth's atmosphere?\u003c/li>\n\u003cli>Why does the concentration of CO\u003csub>2\u003c/sub> go up and down throughout the year?\u003c/li>\n\u003cli>Why do you think Keeling chose Mauna Loa and Antarctica to measure atmospheric CO\u003csub>2\u003c/sub>?\u003c/li>\n\u003cli>Why does the concentration of CO\u003csub>2\u003c/sub> increase over time?\u003c/li>\n\u003cli>What does an increase in CO\u003csub>2\u003c/sub> levels in the atmosphere mean for global warming?\u003c/li>\n\u003c/ul>\n\u003cp>This video explainer is part of our \u003ca href=\"https://ww2.kqed.org/quest/collections/clue-into-climate/\">Clue into Climate\u003c/a> collection of resources.\u003c/p>\n\u003chr>\n\u003cp>\u003c/p>\n\u003cp>\u003cstrong>An interactive version of this explainer is featured in our \u003cstrong>Clue into Climate\u003c/strong> e-book series. Click on the tabs below to download our free e-books or subscribe to our iTunes U course. You can also visit our \u003ca href=\"http://blogs.kqed.org/education/e-books/\">e-books page\u003c/a> to view our other offerings.\u003c/strong>\u003c/p>\n\u003cdiv class=\"clearfix\">\n\u003cp>\u003cimg class=\"alignleft size-full wp-image-11944\" src=\"http://ww2.kqed.org/quest/wp-content/uploads/sites/39/2015/12/Climate-e-book-cover-1-150x194.png\" alt=\"Climate e-book cover 1\" width=\"105\" height=\"136\">\u003c/p>\n\u003cp>Look into the causes of climate change, and discover how scientists develop and use climate models.\u003c/p>\n\u003cp>\u003ca href=\"https://itunes.apple.com/ee/book/clue-into-climate-causes-change/id927517681?mt=13\">\u003cimg class=\"wp-image-11945\" src=\"http://ww2.kqed.org/quest/wp-content/uploads/sites/39/2015/12/Download_on_iTunes_Badge_US-UK_110x40_1004.png\" alt=\"Download on iBooks\" width=\"110\" height=\"40\">\u003c/a> \u003ca href=\"https://itunes.apple.com/us/course/clue-into-climate/id944516910\">\u003cimg alt=\"\">\u003c/a>\u003ca href=\"https://itunes.apple.com/us/course/clue-into-climate/id944516910\">\u003cimg src=\"http://ww2.kqed.org/quest/wp-content/uploads/sites/39/2015/12/E-book-button-for-Web.png\" alt=\"Subscribe on iTunes\" width=\"110\" height=\"40\">\u003c/a>\u003c/p>\n\u003c/div>\n\u003cdiv class=\"clearfix\">\n\u003cp>\u003cimg class=\"alignleft size-full wp-image-14724\" src=\"http://ww2.kqed.org/quest/wp-content/uploads/sites/39/2015/12/Climate-e-book-cover-2-150x194.png\" alt=\"Climate e-book cover 2 web\" width=\"105\" height=\"136\">\u003c/p>\n\u003cp>Learn about how climate change influences precipitation patterns and how it impacts our frozen landscape.\u003c/p>\n\u003cp>\u003ca href=\"https://itunes.apple.com/us/book/clue-into-climate-changing/id930719116?mt=13\">\u003cimg class=\"wp-image-11945\" src=\"http://ww2.kqed.org/quest/wp-content/uploads/sites/39/2015/12/Download_on_iTunes_Badge_US-UK_110x40_1004.png\" alt=\"Download on iBooks\" width=\"110\" height=\"40\">\u003c/a> \u003ca href=\"https://itunes.apple.com/us/course/clue-into-climate/id944516910\">\u003cimg alt=\"\">\u003c/a>\u003ca href=\"https://itunes.apple.com/us/course/clue-into-climate/id944516910\">\u003cimg src=\"http://ww2.kqed.org/quest/wp-content/uploads/sites/39/2015/12/E-book-button-for-Web.png\" alt=\"Subscribe on iTunes\" width=\"110\" height=\"40\">\u003c/a>\u003c/p>\n\u003c/div>\n\u003cdiv class=\"clearfix\">\n\u003cp>\u003cimg class=\"alignleft size-full wp-image-14735\" src=\"http://ww2.kqed.org/quest/wp-content/uploads/sites/39/2015/12/Climate-e-book-cover-3-150x194.png\" alt=\"Climate e-book cover 3 updated web\" width=\"105\" height=\"136\">\u003c/p>\n\u003cp>Investigate shifts in the distribution of plant and animal species due to climate change, and the effects of increased carbon dioxide emissions on the ocean.\u003c/p>\n\u003cp>\u003ca href=\"https://itunes.apple.com/us/book/clue-into-climate-changing/id932195900?mt=13\">\u003cimg class=\"wp-image-11945\" src=\"http://ww2.kqed.org/quest/wp-content/uploads/sites/39/2015/12/Download_on_iTunes_Badge_US-UK_110x40_1004.png\" alt=\"Download on iBooks\" width=\"110\" height=\"40\">\u003c/a> \u003ca href=\"https://itunes.apple.com/us/course/clue-into-climate/id944516910\">\u003cimg alt=\"\">\u003c/a>\u003ca href=\"https://itunes.apple.com/us/course/clue-into-climate/id944516910\">\u003cimg src=\"http://ww2.kqed.org/quest/wp-content/uploads/sites/39/2015/12/E-book-button-for-Web.png\" alt=\"Subscribe on iTunes\" width=\"110\" height=\"40\">\u003c/a>\u003c/p>\n\u003c/div>\n\u003cdiv class=\"clearfix\">\n\u003cp>\u003cimg class=\"alignleft size-full wp-image-14737\" src=\"http://ww2.kqed.org/quest/wp-content/uploads/sites/39/2015/12/Climate-e-book-cover-4-150x194.png\" alt=\"Climate e-book cover 4 web\" width=\"105\" height=\"136\">\u003c/p>\n\u003cp>See how communities are preparing for sea level rise and other impacts of climate change, and ways we can help minimize future climate change.\u003c/p>\n\u003cp>\u003ca href=\"https://itunes.apple.com/us/book/clue-into-climate-facing-our/id932658240?mt=13\">\u003cimg class=\"wp-image-11945\" src=\"http://ww2.kqed.org/quest/wp-content/uploads/sites/39/2015/12/Download_on_iTunes_Badge_US-UK_110x40_1004.png\" alt=\"Download on iBooks\" width=\"110\" height=\"40\">\u003c/a> \u003ca href=\"https://itunes.apple.com/us/course/clue-into-climate/id944516910\">\u003cimg alt=\"\">\u003c/a>\u003ca href=\"https://itunes.apple.com/us/course/clue-into-climate/id944516910\">\u003cimg src=\"http://ww2.kqed.org/quest/wp-content/uploads/sites/39/2015/12/E-book-button-for-Web.png\" alt=\"Subscribe on iTunes\" width=\"110\" height=\"40\">\u003c/a>\u003c/p>\n\u003c/div>\n\u003cdiv class=\"clearfix\">\u003c/div>\n\n\u003c/div>\u003c/p>","attributes":{"named":{},"numeric":[]}}],"link":"/quest/73187/the-keeling-curve-explained","authors":["10216"],"categories":["quest_5","quest_6","quest_9"],"tags":["quest_13104","quest_621","quest_13098","quest_12946","quest_11194","quest_1585","quest_11929","quest_2001","quest_13105"],"collections":["quest_13355"],"featImg":"quest_73380","label":"quest_13355"},"quest_73087":{"type":"posts","id":"quest_73087","meta":{"index":"posts_1591205157","site":"quest","id":"73087","score":null,"sort":[1418419049000]},"guestAuthors":[],"slug":"how-do-greenhouse-gases-work","title":"How Do Greenhouse Gases Work?","publishDate":1418419049,"format":"aside","headTitle":"QUEST | KQED Science","labelTerm":{},"content":"\u003cp>Climate change is primarily caused by the accumulation of heat-trapping gases in the atmosphere. In the mid-1800s, physicist John Tyndall conducted experiments and found that some molecules present in the atmosphere, such as carbon dioxide (CO\u003csub>2\u003c/sub>), actually trap heat from the sun and help keep the planet warm. Molecules that have the ability to trap heat in the atmosphere are called greenhouse gases.\u003c/p>\n\u003cp>\u003cspan class=\"embed-youtube\" style=\"text-align:center; display: block;\">\u003ciframe class=\"youtube-player\" type=\"text/html\" width=\"640\" height=\"360\" src=\"https://www.youtube.com/embed/EB_S_9BKcmo?version=3&rel=1&fs=1&autohide=2&showsearch=0&showinfo=1&iv_load_policy=1&wmode=transparent\" allowfullscreen=\"true\" style=\"border:0;\">\u003c/iframe>\u003c/span>\u003c/p>\n\u003cp>\u003cspan style=\"color: #444444\"> \u003c/span>\u003cbr>\n\u003cem>Click on the video above to explore how greenhouse gases trap heat in the atmosphere.\u003c/em>\u003c/p>\n\u003cp>Major greenhouse gases, like CO\u003csub>2\u003c/sub> and methane (CH\u003csub>4\u003c/sub>), occur naturally and play an important role in Earth's climate. If they didn't exist, Earth would be a much colder planet. However, some human activities like mining and burning fossil fuels (coal, oil and natural gas) for energy and transportation emit molecules of CO\u003csub>2\u003c/sub> and other greenhouse gases into the air. As we burn and mine more fossil fuels, greenhouse gases build up in the atmosphere and cause an overall warming of the planet.\u003c/p>\n\u003cp>Click on the above video to learn how greenhouse gases trap radiation from the sun and warm the planet.\u003c/p>\n\u003ch2>Discussion Questions\u003c/h2>\n\u003cul>\n\u003cli>Where does infrared radiation (IR) come from?\u003c/li>\n\u003cli>What can greenhouse gas molecules do when they encounter infrared radiation (IR)?\u003c/li>\n\u003cli>Describe how greenhouse gas molecules trap heat in the atmosphere.\u003c/li>\n\u003cli>Explain how the accumulation of greenhouse gases in the atmosphere warms the planet.\u003c/li>\n\u003c/ul>\n\u003cp>This video explainer is part of our \u003ca href=\"https://ww2.kqed.org/quest/collections/clue-into-climate/\">Clue into Climate\u003c/a> collection of resources.\u003c/p>\n\u003chr>\n\u003cp>\u003cstrong>This video explainer is featured in our \u003cstrong>Clue into Climate\u003c/strong> e-book series. Click on the tabs below to download our free e-books and subscribe to our iTunes U course. You can also visit our \u003ca href=\"http://blogs.kqed.org/education/e-books/\">e-books page\u003c/a> to view our other offerings.\u003c/strong>\u003c/p>\n\u003cdiv class=\"clearfix\">\n\u003cp>\u003cimg class=\"alignleft size-full wp-image-11944\" src=\"http://ww2.kqed.org/quest/wp-content/uploads/sites/39/2015/12/Climate-e-book-cover-1-150x194.png\" alt=\"Climate e-book cover 1\" width=\"105\" height=\"136\">\u003c/p>\n\u003cp>Look into the causes of climate change, and discover how scientists develop and use climate models.\u003c/p>\n\u003cp>\u003ca href=\"https://itunes.apple.com/ee/book/clue-into-climate-causes-change/id927517681?mt=13\">\u003cimg class=\"wp-image-11945\" src=\"http://ww2.kqed.org/quest/wp-content/uploads/sites/39/2015/12/Download_on_iTunes_Badge_US-UK_110x40_1004.png\" alt=\"Download on iBooks\" width=\"110\" height=\"40\">\u003c/a> \u003ca href=\"https://itunes.apple.com/us/course/clue-into-climate/id944516910\">\u003cimg alt=\"\">\u003c/a>\u003ca href=\"https://itunes.apple.com/us/course/clue-into-climate/id944516910\">\u003cimg src=\"http://ww2.kqed.org/quest/wp-content/uploads/sites/39/2015/12/E-book-button-for-Web.png\" alt=\"Subscribe on iTunes\" width=\"110\" height=\"40\">\u003c/a>\u003c/p>\n\u003c/div>\n\u003cdiv class=\"clearfix\">\n\u003cp>\u003cimg class=\"alignleft size-full wp-image-14724\" src=\"http://ww2.kqed.org/quest/wp-content/uploads/sites/39/2015/12/Climate-e-book-cover-2-150x194.png\" alt=\"Climate e-book cover 2 web\" width=\"105\" height=\"136\">\u003c/p>\n\u003cp>Learn about how climate change influences precipitation patterns and how it impacts our frozen landscape.\u003c/p>\n\u003cp>\u003ca href=\"https://itunes.apple.com/us/book/clue-into-climate-changing/id930719116?mt=13\">\u003cimg class=\"wp-image-11945\" src=\"http://ww2.kqed.org/quest/wp-content/uploads/sites/39/2015/12/Download_on_iTunes_Badge_US-UK_110x40_1004.png\" alt=\"Download on iBooks\" width=\"110\" height=\"40\">\u003c/a> \u003ca href=\"https://itunes.apple.com/us/course/clue-into-climate/id944516910\">\u003cimg alt=\"\">\u003c/a>\u003ca href=\"https://itunes.apple.com/us/course/clue-into-climate/id944516910\">\u003cimg src=\"http://ww2.kqed.org/quest/wp-content/uploads/sites/39/2015/12/E-book-button-for-Web.png\" alt=\"Subscribe on iTunes\" width=\"110\" height=\"40\">\u003c/a>\u003c/p>\n\u003c/div>\n\u003cdiv class=\"clearfix\">\n\u003cp>\u003cimg class=\"alignleft size-full wp-image-14735\" src=\"http://ww2.kqed.org/quest/wp-content/uploads/sites/39/2015/12/Climate-e-book-cover-3-150x194.png\" alt=\"Climate e-book cover 3 updated web\" width=\"105\" height=\"136\">\u003c/p>\n\u003cp>Investigate shifts in the distribution of plant and animal species due to climate change, and the effects of increased carbon dioxide emissions on the ocean.\u003c/p>\n\u003cp>\u003ca href=\"https://itunes.apple.com/us/book/clue-into-climate-changing/id932195900?mt=13\">\u003cimg class=\"wp-image-11945\" src=\"http://ww2.kqed.org/quest/wp-content/uploads/sites/39/2015/12/Download_on_iTunes_Badge_US-UK_110x40_1004.png\" alt=\"Download on iBooks\" width=\"110\" height=\"40\">\u003c/a> \u003ca href=\"https://itunes.apple.com/us/course/clue-into-climate/id944516910\">\u003cimg alt=\"\">\u003c/a>\u003ca href=\"https://itunes.apple.com/us/course/clue-into-climate/id944516910\">\u003cimg src=\"http://ww2.kqed.org/quest/wp-content/uploads/sites/39/2015/12/E-book-button-for-Web.png\" alt=\"Subscribe on iTunes\" width=\"110\" height=\"40\">\u003c/a>\u003c/p>\n\u003c/div>\n\u003cdiv class=\"clearfix\">\n\u003cp>\u003cimg class=\"alignleft size-full wp-image-14737\" src=\"http://ww2.kqed.org/quest/wp-content/uploads/sites/39/2015/12/Climate-e-book-cover-4-150x194.png\" alt=\"Climate e-book cover 4 web\" width=\"105\" height=\"136\">\u003c/p>\n\u003cp>See how communities are preparing for sea level rise and other impacts of climate change, and ways we can help minimize future climate change.\u003c/p>\n\u003cp>\u003ca href=\"https://itunes.apple.com/us/book/clue-into-climate-facing-our/id932658240?mt=13\">\u003cimg class=\"wp-image-11945\" src=\"http://ww2.kqed.org/quest/wp-content/uploads/sites/39/2015/12/Download_on_iTunes_Badge_US-UK_110x40_1004.png\" alt=\"Download on iBooks\" width=\"110\" height=\"40\">\u003c/a> \u003ca href=\"https://itunes.apple.com/us/course/clue-into-climate/id944516910\">\u003cimg alt=\"\">\u003c/a>\u003ca href=\"https://itunes.apple.com/us/course/clue-into-climate/id944516910\">\u003cimg src=\"http://ww2.kqed.org/quest/wp-content/uploads/sites/39/2015/12/E-book-button-for-Web.png\" alt=\"Subscribe on iTunes\" width=\"110\" height=\"40\">\u003c/a>\u003c/p>\n\u003c/div>\n\u003cdiv class=\"clearfix\">\u003c/div>\n\u003cp>[ad fullwidth]\u003c/p>\u003cp>\u003c/p>\n","blocks":[],"excerpt":"Find out how greenhouse gases trap heat in the Earth's atmosphere with this interactive graphic.","status":"publish","parent":0,"modified":1645676070,"stats":{"hasAudio":false,"hasVideo":true,"hasChartOrMap":false,"iframeSrcs":[],"hasGoogleForm":false,"hasGallery":false,"hasHearkenModule":false,"hasPolis":false,"paragraphCount":20,"wordCount":367},"headData":{"title":"How Do Greenhouse Gases Work? - QUEST","description":"Find out how greenhouse gases trap heat in the Earth's atmosphere with this interactive graphic.","ogTitle":"","ogDescription":"","ogImgId":"","twTitle":"","twDescription":"","twImgId":""},"disqusIdentifier":"73087 http://science.kqed.org/quest/?p=73087","disqusUrl":"https://ww2.kqed.org/quest/2014/12/12/how-do-greenhouse-gases-work/","disqusTitle":"How Do Greenhouse Gases Work?","source":"Environment","sourceUrl":"https://ww2.kqed.org/quest/category/environment/","templateType":"standard","featuredImageType":"standard","excludeFromSiteSearch":"Include","path":"/quest/73087/how-do-greenhouse-gases-work","audioTrackLength":null,"parsedContent":[{"type":"contentString","content":"\u003cdiv class=\"post-body\">\u003cp>\u003cp>Climate change is primarily caused by the accumulation of heat-trapping gases in the atmosphere. In the mid-1800s, physicist John Tyndall conducted experiments and found that some molecules present in the atmosphere, such as carbon dioxide (CO\u003csub>2\u003c/sub>), actually trap heat from the sun and help keep the planet warm. Molecules that have the ability to trap heat in the atmosphere are called greenhouse gases.\u003c/p>\n\u003cp>\u003cspan class=\"embed-youtube\" style=\"text-align:center; display: block;\">\u003ciframe class=\"youtube-player\" type=\"text/html\" width=\"640\" height=\"360\" src=\"https://www.youtube.com/embed/EB_S_9BKcmo?version=3&rel=1&fs=1&autohide=2&showsearch=0&showinfo=1&iv_load_policy=1&wmode=transparent\" allowfullscreen=\"true\" style=\"border:0;\">\u003c/iframe>\u003c/span>\u003c/p>\n\u003cp>\u003cspan style=\"color: #444444\"> \u003c/span>\u003cbr>\n\u003cem>Click on the video above to explore how greenhouse gases trap heat in the atmosphere.\u003c/em>\u003c/p>\n\u003cp>Major greenhouse gases, like CO\u003csub>2\u003c/sub> and methane (CH\u003csub>4\u003c/sub>), occur naturally and play an important role in Earth's climate. If they didn't exist, Earth would be a much colder planet. However, some human activities like mining and burning fossil fuels (coal, oil and natural gas) for energy and transportation emit molecules of CO\u003csub>2\u003c/sub> and other greenhouse gases into the air. As we burn and mine more fossil fuels, greenhouse gases build up in the atmosphere and cause an overall warming of the planet.\u003c/p>\n\u003cp>Click on the above video to learn how greenhouse gases trap radiation from the sun and warm the planet.\u003c/p>\n\u003ch2>Discussion Questions\u003c/h2>\n\u003cul>\n\u003cli>Where does infrared radiation (IR) come from?\u003c/li>\n\u003cli>What can greenhouse gas molecules do when they encounter infrared radiation (IR)?\u003c/li>\n\u003cli>Describe how greenhouse gas molecules trap heat in the atmosphere.\u003c/li>\n\u003cli>Explain how the accumulation of greenhouse gases in the atmosphere warms the planet.\u003c/li>\n\u003c/ul>\n\u003cp>This video explainer is part of our \u003ca href=\"https://ww2.kqed.org/quest/collections/clue-into-climate/\">Clue into Climate\u003c/a> collection of resources.\u003c/p>\n\u003chr>\n\u003cp>\u003cstrong>This video explainer is featured in our \u003cstrong>Clue into Climate\u003c/strong> e-book series. Click on the tabs below to download our free e-books and subscribe to our iTunes U course. You can also visit our \u003ca href=\"http://blogs.kqed.org/education/e-books/\">e-books page\u003c/a> to view our other offerings.\u003c/strong>\u003c/p>\n\u003cdiv class=\"clearfix\">\n\u003cp>\u003cimg class=\"alignleft size-full wp-image-11944\" src=\"http://ww2.kqed.org/quest/wp-content/uploads/sites/39/2015/12/Climate-e-book-cover-1-150x194.png\" alt=\"Climate e-book cover 1\" width=\"105\" height=\"136\">\u003c/p>\n\u003cp>Look into the causes of climate change, and discover how scientists develop and use climate models.\u003c/p>\n\u003cp>\u003ca href=\"https://itunes.apple.com/ee/book/clue-into-climate-causes-change/id927517681?mt=13\">\u003cimg class=\"wp-image-11945\" src=\"http://ww2.kqed.org/quest/wp-content/uploads/sites/39/2015/12/Download_on_iTunes_Badge_US-UK_110x40_1004.png\" alt=\"Download on iBooks\" width=\"110\" height=\"40\">\u003c/a> \u003ca href=\"https://itunes.apple.com/us/course/clue-into-climate/id944516910\">\u003cimg alt=\"\">\u003c/a>\u003ca href=\"https://itunes.apple.com/us/course/clue-into-climate/id944516910\">\u003cimg src=\"http://ww2.kqed.org/quest/wp-content/uploads/sites/39/2015/12/E-book-button-for-Web.png\" alt=\"Subscribe on iTunes\" width=\"110\" height=\"40\">\u003c/a>\u003c/p>\n\u003c/div>\n\u003cdiv class=\"clearfix\">\n\u003cp>\u003cimg class=\"alignleft size-full wp-image-14724\" src=\"http://ww2.kqed.org/quest/wp-content/uploads/sites/39/2015/12/Climate-e-book-cover-2-150x194.png\" alt=\"Climate e-book cover 2 web\" width=\"105\" height=\"136\">\u003c/p>\n\u003cp>Learn about how climate change influences precipitation patterns and how it impacts our frozen landscape.\u003c/p>\n\u003cp>\u003ca href=\"https://itunes.apple.com/us/book/clue-into-climate-changing/id930719116?mt=13\">\u003cimg class=\"wp-image-11945\" src=\"http://ww2.kqed.org/quest/wp-content/uploads/sites/39/2015/12/Download_on_iTunes_Badge_US-UK_110x40_1004.png\" alt=\"Download on iBooks\" width=\"110\" height=\"40\">\u003c/a> \u003ca href=\"https://itunes.apple.com/us/course/clue-into-climate/id944516910\">\u003cimg alt=\"\">\u003c/a>\u003ca href=\"https://itunes.apple.com/us/course/clue-into-climate/id944516910\">\u003cimg src=\"http://ww2.kqed.org/quest/wp-content/uploads/sites/39/2015/12/E-book-button-for-Web.png\" alt=\"Subscribe on iTunes\" width=\"110\" height=\"40\">\u003c/a>\u003c/p>\n\u003c/div>\n\u003cdiv class=\"clearfix\">\n\u003cp>\u003cimg class=\"alignleft size-full wp-image-14735\" src=\"http://ww2.kqed.org/quest/wp-content/uploads/sites/39/2015/12/Climate-e-book-cover-3-150x194.png\" alt=\"Climate e-book cover 3 updated web\" width=\"105\" height=\"136\">\u003c/p>\n\u003cp>Investigate shifts in the distribution of plant and animal species due to climate change, and the effects of increased carbon dioxide emissions on the ocean.\u003c/p>\n\u003cp>\u003ca href=\"https://itunes.apple.com/us/book/clue-into-climate-changing/id932195900?mt=13\">\u003cimg class=\"wp-image-11945\" src=\"http://ww2.kqed.org/quest/wp-content/uploads/sites/39/2015/12/Download_on_iTunes_Badge_US-UK_110x40_1004.png\" alt=\"Download on iBooks\" width=\"110\" height=\"40\">\u003c/a> \u003ca href=\"https://itunes.apple.com/us/course/clue-into-climate/id944516910\">\u003cimg alt=\"\">\u003c/a>\u003ca href=\"https://itunes.apple.com/us/course/clue-into-climate/id944516910\">\u003cimg src=\"http://ww2.kqed.org/quest/wp-content/uploads/sites/39/2015/12/E-book-button-for-Web.png\" alt=\"Subscribe on iTunes\" width=\"110\" height=\"40\">\u003c/a>\u003c/p>\n\u003c/div>\n\u003cdiv class=\"clearfix\">\n\u003cp>\u003cimg class=\"alignleft size-full wp-image-14737\" src=\"http://ww2.kqed.org/quest/wp-content/uploads/sites/39/2015/12/Climate-e-book-cover-4-150x194.png\" alt=\"Climate e-book cover 4 web\" width=\"105\" height=\"136\">\u003c/p>\n\u003cp>See how communities are preparing for sea level rise and other impacts of climate change, and ways we can help minimize future climate change.\u003c/p>\n\u003cp>\u003ca href=\"https://itunes.apple.com/us/book/clue-into-climate-facing-our/id932658240?mt=13\">\u003cimg class=\"wp-image-11945\" src=\"http://ww2.kqed.org/quest/wp-content/uploads/sites/39/2015/12/Download_on_iTunes_Badge_US-UK_110x40_1004.png\" alt=\"Download on iBooks\" width=\"110\" height=\"40\">\u003c/a> \u003ca href=\"https://itunes.apple.com/us/course/clue-into-climate/id944516910\">\u003cimg alt=\"\">\u003c/a>\u003ca href=\"https://itunes.apple.com/us/course/clue-into-climate/id944516910\">\u003cimg src=\"http://ww2.kqed.org/quest/wp-content/uploads/sites/39/2015/12/E-book-button-for-Web.png\" alt=\"Subscribe on iTunes\" width=\"110\" height=\"40\">\u003c/a>\u003c/p>\n\u003c/div>\n\u003cdiv class=\"clearfix\">\u003c/div>\n\u003cp>\u003c/p>\u003c/div>","attributes":{"named":{},"numeric":[]}},{"type":"component","content":"","name":"ad","attributes":{"named":{"label":"fullwidth"},"numeric":["fullwidth"]}},{"type":"contentString","content":"\u003cdiv class=\"post-body\">\u003cp>\u003c/p>\u003cp>\u003c/p>\n\u003c/div>\u003c/p>","attributes":{"named":{},"numeric":[]}}],"link":"/quest/73087/how-do-greenhouse-gases-work","authors":["10216"],"categories":["quest_5","quest_6","quest_1"],"tags":["quest_621","quest_13098","quest_12946","quest_1273","quest_1585","quest_2349"],"collections":["quest_13355"],"featImg":"quest_73417","label":"source_quest_73087"},"quest_73100":{"type":"posts","id":"quest_73100","meta":{"index":"posts_1591205157","site":"quest","id":"73100","score":null,"sort":[1418418969000]},"guestAuthors":[],"slug":"water-vapors-role-in-climate-change","title":"Water Vapor's Role in Climate Change","publishDate":1418418969,"format":"aside","headTitle":"QUEST | KQED Science","labelTerm":{},"content":"\u003cp>Water covers nearly three-quarters of Earth. It is continuously moving above, on and below Earth's surface, cycling among ice, liquid water and vapor. This cycling of water shapes the climate by delivering rain and snow, and it supports life on Earth. Water and climate are deeply interconnected, and as the climate changes so does the distribution and cycling of Earth's water.\u003c/p>\n\u003cp> \u003c/p>\n\u003cdiv class=\"jwplayer\">\n\u003cp>\u003ca href=\"https://youtu.be/fzEcIr4RDgA\">https://youtu.be/fzEcIr4RDgA\u003c/a>\u003c/p>\n\u003c/div>\n\u003cp>\u003cem>Discover how water and climate affect each other by watching the video in the graphic above.\u003c/em>\u003c/p>\n\u003cp>With climate change, Earth is getting warmer as greenhouse gases build up and trap more heat in the atmosphere. These warmer temperatures cause increased evaporation of water from places like oceans, lakes, streams and soil. This leads to higher levels of water vapor in the atmosphere, which means that precipitation events tend to be heavier. Whether the water falls as rain or snow depends on temperature. Therefore, if winter temperatures remain below freezing in areas like the northeastern United States, the increased moisture in the air could mean heavier snow storms.\u003c/p>\n\u003cp>Increased water vapor in the air can also further increase warming. Water vapor is actually a greenhouse gas, which traps heat in the atmosphere and causes temperatures to rise. But unlike other greenhouse gases that can linger in the atmosphere for years, water vapor usually stays in the air for a few days before falling back to Earth as precipitation.\u003c/p>\n\u003cp>[ad fullwidth]\u003c/p>\n\u003cp>So, as warm temperatures lead to more water vapor in the air, more water vapor in the air leads to warmer temperatures, which creates a positive feedback loop. A positive feedback loop is called \"positive\" not because it's a good thing, but rather because the effects of one process enhance the effects of another, which in turn positively reinforce the effects of the original.\u003c/p>\n\u003ch2>Discussion Questions\u003c/h2>\n\u003cul>\n\u003cli>Why is water vapor considered a \"greenhouse gas?\"\u003c/li>\n\u003cli>How does water vapor differ from other greenhouse gases?\u003c/li>\n\u003cli>Using water vapor as an example, describe what is meant by a \"positive feedback loop.\"\u003c/li>\n\u003cli>How can heavier snow events be explained in terms of climate change?\u003c/li>\n\u003c/ul>\n\u003cp>This video explainer is part of our \u003ca href=\"https://ww2.kqed.org/quest/collections/clue-into-climate/\">Clue into Climate\u003c/a> collection of resources.\u003c/p>\n\u003chr>\n\u003cp>\u003c/p>\n\u003cp>\u003cstrong>An interactive version of this explainer is featured in our \u003cstrong>Clue into Climate\u003c/strong> e-book series. Click on the tabs below to download our free e-books and subscribe to our iTunes U course. You can also visit our \u003ca href=\"http://blogs.kqed.org/education/e-books/\">e-books page\u003c/a> to view our other offerings.\u003c/strong>\u003c/p>\n\u003cdiv class=\"clearfix\">\n\u003cp>\u003cimg class=\"alignleft size-full wp-image-11944\" src=\"http://ww2.kqed.org/quest/wp-content/uploads/sites/39/2015/12/Climate-e-book-cover-1-150x194.png\" alt=\"Climate e-book cover 1\" width=\"105\" height=\"136\">\u003c/p>\n\u003cp>Look into the causes of climate change, and discover how scientists develop and use climate models.\u003c/p>\n\u003cp>\u003ca href=\"https://itunes.apple.com/ee/book/clue-into-climate-causes-change/id927517681?mt=13\">\u003cimg class=\"wp-image-11945\" src=\"http://ww2.kqed.org/quest/wp-content/uploads/sites/39/2015/12/Download_on_iTunes_Badge_US-UK_110x40_1004.png\" alt=\"Download on iBooks\" width=\"110\" height=\"40\">\u003c/a> \u003ca href=\"https://itunes.apple.com/us/course/clue-into-climate/id944516910\">\u003cimg alt=\"\">\u003c/a>\u003ca href=\"https://itunes.apple.com/us/course/clue-into-climate/id944516910\">\u003cimg src=\"http://ww2.kqed.org/quest/wp-content/uploads/sites/39/2015/12/E-book-button-for-Web.png\" alt=\"Subscribe on iTunes\" width=\"110\" height=\"40\">\u003c/a>\u003c/p>\n\u003c/div>\n\u003cdiv class=\"clearfix\">\n\u003cp>\u003cimg class=\"alignleft size-full wp-image-14724\" src=\"http://ww2.kqed.org/quest/wp-content/uploads/sites/39/2015/12/Climate-e-book-cover-2-150x194.png\" alt=\"Climate e-book cover 2 web\" width=\"105\" height=\"136\">\u003c/p>\n\u003cp>Learn about how climate change influences precipitation patterns and how it impacts our frozen landscape.\u003c/p>\n\u003cp>\u003ca href=\"https://itunes.apple.com/us/book/clue-into-climate-changing/id930719116?mt=13\">\u003cimg class=\"wp-image-11945\" src=\"http://ww2.kqed.org/quest/wp-content/uploads/sites/39/2015/12/Download_on_iTunes_Badge_US-UK_110x40_1004.png\" alt=\"Download on iBooks\" width=\"110\" height=\"40\">\u003c/a> \u003ca href=\"https://itunes.apple.com/us/course/clue-into-climate/id944516910\">\u003cimg alt=\"\">\u003c/a>\u003ca href=\"https://itunes.apple.com/us/course/clue-into-climate/id944516910\">\u003cimg src=\"http://ww2.kqed.org/quest/wp-content/uploads/sites/39/2015/12/E-book-button-for-Web.png\" alt=\"Subscribe on iTunes\" width=\"110\" height=\"40\">\u003c/a>\u003c/p>\n\u003c/div>\n\u003cdiv class=\"clearfix\">\n\u003cp>\u003cimg class=\"alignleft size-full wp-image-14735\" src=\"http://ww2.kqed.org/quest/wp-content/uploads/sites/39/2015/12/Climate-e-book-cover-3-150x194.png\" alt=\"Climate e-book cover 3 updated web\" width=\"105\" height=\"136\">\u003c/p>\n\u003cp>Investigate shifts in the distribution of plant and animal species due to climate change, and the effects of increased carbon dioxide emissions on the ocean.\u003c/p>\n\u003cp>\u003ca href=\"https://itunes.apple.com/us/book/clue-into-climate-changing/id932195900?mt=13\">\u003cimg class=\"wp-image-11945\" src=\"http://ww2.kqed.org/quest/wp-content/uploads/sites/39/2015/12/Download_on_iTunes_Badge_US-UK_110x40_1004.png\" alt=\"Download on iBooks\" width=\"110\" height=\"40\">\u003c/a> \u003ca href=\"https://itunes.apple.com/us/course/clue-into-climate/id944516910\">\u003cimg alt=\"\">\u003c/a>\u003ca href=\"https://itunes.apple.com/us/course/clue-into-climate/id944516910\">\u003cimg src=\"http://ww2.kqed.org/quest/wp-content/uploads/sites/39/2015/12/E-book-button-for-Web.png\" alt=\"Subscribe on iTunes\" width=\"110\" height=\"40\">\u003c/a>\u003c/p>\n\u003c/div>\n\u003cdiv class=\"clearfix\">\n\u003cp>\u003cimg class=\"alignleft size-full wp-image-14737\" src=\"http://ww2.kqed.org/quest/wp-content/uploads/sites/39/2015/12/Climate-e-book-cover-4-150x194.png\" alt=\"Climate e-book cover 4 web\" width=\"105\" height=\"136\">\u003c/p>\n\u003cp>See how communities are preparing for sea level rise and other impacts of climate change, and ways we can help minimize future climate change.\u003c/p>\n\u003cp>\u003ca href=\"https://itunes.apple.com/us/book/clue-into-climate-facing-our/id932658240?mt=13\">\u003cimg class=\"wp-image-11945\" src=\"http://ww2.kqed.org/quest/wp-content/uploads/sites/39/2015/12/Download_on_iTunes_Badge_US-UK_110x40_1004.png\" alt=\"Download on iBooks\" width=\"110\" height=\"40\">\u003c/a> \u003ca href=\"https://itunes.apple.com/us/course/clue-into-climate/id944516910\">\u003cimg alt=\"\">\u003c/a>\u003ca href=\"https://itunes.apple.com/us/course/clue-into-climate/id944516910\">\u003cimg src=\"http://ww2.kqed.org/quest/wp-content/uploads/sites/39/2015/12/E-book-button-for-Web.png\" alt=\"Subscribe on iTunes\" width=\"110\" height=\"40\">\u003c/a>\u003c/p>\n\u003c/div>\n\u003cdiv class=\"clearfix\">\u003c/div>\n\n","blocks":[],"excerpt":"Learn how water and the Earth's climate directly affect each other in this interactive graphic.","status":"publish","parent":0,"modified":1587659640,"stats":{"hasAudio":false,"hasVideo":false,"hasChartOrMap":false,"iframeSrcs":[],"hasGoogleForm":false,"hasGallery":false,"hasHearkenModule":false,"hasPolis":false,"paragraphCount":21,"wordCount":489},"headData":{"title":"Water Vapor's Role in Climate Change | KQED","description":"Learn how water and the Earth's climate directly affect each other in this interactive graphic.","ogTitle":"","ogDescription":"","ogImgId":"","twTitle":"","twDescription":"","twImgId":""},"disqusIdentifier":"73100 http://science.kqed.org/quest/?p=73100","disqusUrl":"https://ww2.kqed.org/quest/2014/12/12/water-vapors-role-in-climate-change/","disqusTitle":"Water Vapor's Role in Climate Change","source":"Environment","sourceUrl":"https://ww2.kqed.org/quest/category/environment/","path":"/quest/73100/water-vapors-role-in-climate-change","audioTrackLength":null,"parsedContent":[{"type":"contentString","content":"\u003cdiv class=\"post-body\">\u003cp>\u003cp>Water covers nearly three-quarters of Earth. It is continuously moving above, on and below Earth's surface, cycling among ice, liquid water and vapor. This cycling of water shapes the climate by delivering rain and snow, and it supports life on Earth. Water and climate are deeply interconnected, and as the climate changes so does the distribution and cycling of Earth's water.\u003c/p>\n\u003cp> \u003c/p>\n\u003cdiv class=\"jwplayer\">\n\u003cp>\u003ca href=\"https://youtu.be/fzEcIr4RDgA\">https://youtu.be/fzEcIr4RDgA\u003c/a>\u003c/p>\n\u003c/div>\n\u003cp>\u003cem>Discover how water and climate affect each other by watching the video in the graphic above.\u003c/em>\u003c/p>\n\u003cp>With climate change, Earth is getting warmer as greenhouse gases build up and trap more heat in the atmosphere. These warmer temperatures cause increased evaporation of water from places like oceans, lakes, streams and soil. This leads to higher levels of water vapor in the atmosphere, which means that precipitation events tend to be heavier. Whether the water falls as rain or snow depends on temperature. Therefore, if winter temperatures remain below freezing in areas like the northeastern United States, the increased moisture in the air could mean heavier snow storms.\u003c/p>\n\u003cp>Increased water vapor in the air can also further increase warming. Water vapor is actually a greenhouse gas, which traps heat in the atmosphere and causes temperatures to rise. But unlike other greenhouse gases that can linger in the atmosphere for years, water vapor usually stays in the air for a few days before falling back to Earth as precipitation.\u003c/p>\n\u003cp>\u003c/p>\u003c/div>","attributes":{"named":{},"numeric":[]}},{"type":"component","content":"","name":"ad","attributes":{"named":{"label":"fullwidth"},"numeric":["fullwidth"]}},{"type":"contentString","content":"\u003cdiv class=\"post-body\">\u003cp>\u003c/p>\n\u003cp>So, as warm temperatures lead to more water vapor in the air, more water vapor in the air leads to warmer temperatures, which creates a positive feedback loop. A positive feedback loop is called \"positive\" not because it's a good thing, but rather because the effects of one process enhance the effects of another, which in turn positively reinforce the effects of the original.\u003c/p>\n\u003ch2>Discussion Questions\u003c/h2>\n\u003cul>\n\u003cli>Why is water vapor considered a \"greenhouse gas?\"\u003c/li>\n\u003cli>How does water vapor differ from other greenhouse gases?\u003c/li>\n\u003cli>Using water vapor as an example, describe what is meant by a \"positive feedback loop.\"\u003c/li>\n\u003cli>How can heavier snow events be explained in terms of climate change?\u003c/li>\n\u003c/ul>\n\u003cp>This video explainer is part of our \u003ca href=\"https://ww2.kqed.org/quest/collections/clue-into-climate/\">Clue into Climate\u003c/a> collection of resources.\u003c/p>\n\u003chr>\n\u003cp>\u003c/p>\n\u003cp>\u003cstrong>An interactive version of this explainer is featured in our \u003cstrong>Clue into Climate\u003c/strong> e-book series. Click on the tabs below to download our free e-books and subscribe to our iTunes U course. You can also visit our \u003ca href=\"http://blogs.kqed.org/education/e-books/\">e-books page\u003c/a> to view our other offerings.\u003c/strong>\u003c/p>\n\u003cdiv class=\"clearfix\">\n\u003cp>\u003cimg class=\"alignleft size-full wp-image-11944\" src=\"http://ww2.kqed.org/quest/wp-content/uploads/sites/39/2015/12/Climate-e-book-cover-1-150x194.png\" alt=\"Climate e-book cover 1\" width=\"105\" height=\"136\">\u003c/p>\n\u003cp>Look into the causes of climate change, and discover how scientists develop and use climate models.\u003c/p>\n\u003cp>\u003ca href=\"https://itunes.apple.com/ee/book/clue-into-climate-causes-change/id927517681?mt=13\">\u003cimg class=\"wp-image-11945\" src=\"http://ww2.kqed.org/quest/wp-content/uploads/sites/39/2015/12/Download_on_iTunes_Badge_US-UK_110x40_1004.png\" alt=\"Download on iBooks\" width=\"110\" height=\"40\">\u003c/a> \u003ca href=\"https://itunes.apple.com/us/course/clue-into-climate/id944516910\">\u003cimg alt=\"\">\u003c/a>\u003ca href=\"https://itunes.apple.com/us/course/clue-into-climate/id944516910\">\u003cimg src=\"http://ww2.kqed.org/quest/wp-content/uploads/sites/39/2015/12/E-book-button-for-Web.png\" alt=\"Subscribe on iTunes\" width=\"110\" height=\"40\">\u003c/a>\u003c/p>\n\u003c/div>\n\u003cdiv class=\"clearfix\">\n\u003cp>\u003cimg class=\"alignleft size-full wp-image-14724\" src=\"http://ww2.kqed.org/quest/wp-content/uploads/sites/39/2015/12/Climate-e-book-cover-2-150x194.png\" alt=\"Climate e-book cover 2 web\" width=\"105\" height=\"136\">\u003c/p>\n\u003cp>Learn about how climate change influences precipitation patterns and how it impacts our frozen landscape.\u003c/p>\n\u003cp>\u003ca href=\"https://itunes.apple.com/us/book/clue-into-climate-changing/id930719116?mt=13\">\u003cimg class=\"wp-image-11945\" src=\"http://ww2.kqed.org/quest/wp-content/uploads/sites/39/2015/12/Download_on_iTunes_Badge_US-UK_110x40_1004.png\" alt=\"Download on iBooks\" width=\"110\" height=\"40\">\u003c/a> \u003ca href=\"https://itunes.apple.com/us/course/clue-into-climate/id944516910\">\u003cimg alt=\"\">\u003c/a>\u003ca href=\"https://itunes.apple.com/us/course/clue-into-climate/id944516910\">\u003cimg src=\"http://ww2.kqed.org/quest/wp-content/uploads/sites/39/2015/12/E-book-button-for-Web.png\" alt=\"Subscribe on iTunes\" width=\"110\" height=\"40\">\u003c/a>\u003c/p>\n\u003c/div>\n\u003cdiv class=\"clearfix\">\n\u003cp>\u003cimg class=\"alignleft size-full wp-image-14735\" src=\"http://ww2.kqed.org/quest/wp-content/uploads/sites/39/2015/12/Climate-e-book-cover-3-150x194.png\" alt=\"Climate e-book cover 3 updated web\" width=\"105\" height=\"136\">\u003c/p>\n\u003cp>Investigate shifts in the distribution of plant and animal species due to climate change, and the effects of increased carbon dioxide emissions on the ocean.\u003c/p>\n\u003cp>\u003ca href=\"https://itunes.apple.com/us/book/clue-into-climate-changing/id932195900?mt=13\">\u003cimg class=\"wp-image-11945\" src=\"http://ww2.kqed.org/quest/wp-content/uploads/sites/39/2015/12/Download_on_iTunes_Badge_US-UK_110x40_1004.png\" alt=\"Download on iBooks\" width=\"110\" height=\"40\">\u003c/a> \u003ca href=\"https://itunes.apple.com/us/course/clue-into-climate/id944516910\">\u003cimg alt=\"\">\u003c/a>\u003ca href=\"https://itunes.apple.com/us/course/clue-into-climate/id944516910\">\u003cimg src=\"http://ww2.kqed.org/quest/wp-content/uploads/sites/39/2015/12/E-book-button-for-Web.png\" alt=\"Subscribe on iTunes\" width=\"110\" height=\"40\">\u003c/a>\u003c/p>\n\u003c/div>\n\u003cdiv class=\"clearfix\">\n\u003cp>\u003cimg class=\"alignleft size-full wp-image-14737\" src=\"http://ww2.kqed.org/quest/wp-content/uploads/sites/39/2015/12/Climate-e-book-cover-4-150x194.png\" alt=\"Climate e-book cover 4 web\" width=\"105\" height=\"136\">\u003c/p>\n\u003cp>See how communities are preparing for sea level rise and other impacts of climate change, and ways we can help minimize future climate change.\u003c/p>\n\u003cp>\u003ca href=\"https://itunes.apple.com/us/book/clue-into-climate-facing-our/id932658240?mt=13\">\u003cimg class=\"wp-image-11945\" src=\"http://ww2.kqed.org/quest/wp-content/uploads/sites/39/2015/12/Download_on_iTunes_Badge_US-UK_110x40_1004.png\" alt=\"Download on iBooks\" width=\"110\" height=\"40\">\u003c/a> \u003ca href=\"https://itunes.apple.com/us/course/clue-into-climate/id944516910\">\u003cimg alt=\"\">\u003c/a>\u003ca href=\"https://itunes.apple.com/us/course/clue-into-climate/id944516910\">\u003cimg src=\"http://ww2.kqed.org/quest/wp-content/uploads/sites/39/2015/12/E-book-button-for-Web.png\" alt=\"Subscribe on iTunes\" width=\"110\" height=\"40\">\u003c/a>\u003c/p>\n\u003c/div>\n\u003cdiv class=\"clearfix\">\u003c/div>\n\n\u003c/div>\u003c/p>","attributes":{"named":{},"numeric":[]}}],"link":"/quest/73100/water-vapors-role-in-climate-change","authors":["10216"],"categories":["quest_5","quest_6","quest_11766"],"tags":["quest_621","quest_13098","quest_12946","quest_11194","quest_1585","quest_13107"],"collections":["quest_13355"],"featImg":"quest_73397","label":"source_quest_73100"},"quest_73184":{"type":"posts","id":"quest_73184","meta":{"index":"posts_1591205157","site":"quest","id":"73184","score":null,"sort":[1418374857000]},"guestAuthors":[],"slug":"ocean-acidification-and-marine-life","title":"Ocean Acidification and Marine Life","publishDate":1418374857,"format":"aside","headTitle":"QUEST | KQED Science","labelTerm":{},"content":"\u003cp>Since the Industrial Revolution in the late 1700s, we have been mining and burning coal, oil and natural gas for energy and transportation. These processes release carbon dioxide (CO\u003csub>2\u003c/sub>) into the atmosphere. It is well established that the rising level of CO\u003csub>2\u003c/sub> in our atmosphere is a major cause of global warming. However, the increase in CO\u003csub>2\u003c/sub> is also causing changes to the chemistry of the ocean. The ocean absorbs some of the excess atmospheric CO\u003csub>2\u003c/sub>, which causes what scientists call \u003cstrong>ocean acidification\u003c/strong>. And ocean acidification could have major impacts on marine life.\u003c/p>\n\u003cp>\u003ciframe title=\"Ocean Acidification Video\" width=\"640\" height=\"480\" src=\"https://www.youtube.com/embed/yH3E7Vs1Nj8?feature=oembed\" frameborder=\"0\" allow=\"accelerometer; autoplay; encrypted-media; gyroscope; picture-in-picture\" allowfullscreen>\u003c/iframe>\u003c/p>\n\u003cp>\u003cem>Watch the video to see how ocean acidification is affecting some shelled marine organisms.\u003c/em>\u003c/p>\n\u003cp>What exactly is ocean acidification? Acidity is a measure of the concentration of hydrogen ions (H\u003csup>+\u003c/sup>) in a given solution. When CO\u003csub>2\u003c/sub> from the air mixes with ocean water it combines and forms carbonic acid (H\u003csub>2\u003c/sub>CO\u003csub>3\u003c/sub>). The carbonic acid then dissociates into hydrogen (H\u003csup>+\u003c/sup>) and bicarbonate (HCO\u003csub>3\u003c/sub>\u003csup>-\u003c/sup>) ions.\u003c/p>\n\u003cp>\u003cstrong>CO\u003csub>2\u003c/sub> (carbon dioxide) + H\u003csub>2\u003c/sub>O (water) → H\u003csub>2\u003c/sub>CO\u003csub>3\u003c/sub> (carbonic acid)\u003c/strong>\u003c/p>\n\u003cp>[ad fullwidth]\u003c/p>\n\u003cp>\u003cstrong>H\u003csub>2\u003c/sub>CO\u003csub>3\u003c/sub> (carbonic acid) → H\u003csup>+\u003c/sup> (hydrogen ions) + HCO\u003csub>3\u003c/sub>\u003csup>-\u003c/sup> (bicarbonate) \u003c/strong>\u003c/p>\n\u003cp>This chemical reaction causes an increase in hydrogen ions in the seawater, thus increasing ocean acidity. The acidity of a solution is often reported in terms of pH. The pH scale ranges from 0 to 14. A value below 7 is acidic and a value above 7 is basic. The more acidic a solution, the higher the concentration of hydrogen ions and the lower the pH. There are many different ways to measure pH, ranging from litmus paper to sophisticated sensors.\u003c/p>\n\u003cp>Over the last several decades scientists have been measuring the levels of CO\u003csub>2\u003c/sub> and pH throughout the ocean. \u003ca href=\"http://www.pmel.noaa.gov/co2/file/Hawaii+Carbon+Dioxide+Time-Series\">Data\u003c/a> from these types of measurements show that as the concentration of CO\u003csub>2\u003c/sub> in the atmosphere increases, levels of CO\u003csub>2\u003c/sub> in the ocean also increase, increasing the levels of hydrogen ions and thus decreasing the pH of the ocean. This suggests that atmospheric CO\u003csub>2\u003c/sub> is contributing to the acidification of the ocean. It's important to note that the pH of the ocean is still basic (around a pH of 8), but scientists use the term ocean acidification to indicate the increase in hydrogen ions in the ocean, which lowers the ocean's pH.\u003c/p>\n\u003cp>Ocean acidification could have major impacts on the health and biodiversity of the ocean. For example, the increase in hydrogen ions in the ocean is making it harder for some marine invertebrates like corals, oysters and tiny sea snails to form their shells and grow. This has implications that extend throughout the marine food web.\u003c/p>\n\u003ch2>Discussion Questions\u003c/h2>\n\u003cul>\n\u003cli>What does the term ocean acidification mean?\u003c/li>\n\u003cli>Why is the ocean becoming more acidic?\u003c/li>\n\u003cli>If the pH of the ocean is still around 8, why do scientists use the term ocean acidification?\u003c/li>\n\u003cli>How does a decrease in ocean pH affect the ability of some marine organisms to build their shells?\u003c/li>\n\u003cli>What do you think are some possible effects of ocean acidification?\u003c/li>\n\u003c/ul>\n\u003chr>\n\u003cp>\u003c/p>\n\u003cp>\u003cstrong>An interactive version of this explainer is featured in our \u003cstrong>Clue into Climate\u003c/strong> e-book series. Click on the tabs below to download our free e-books and subscribe to our iTunes U course. You can also visit our \u003ca href=\"http://blogs.kqed.org/education/e-books/\">e-books page\u003c/a> to view our other offerings.\u003c/strong>\u003c/p>\n\u003cdiv class=\"clearfix\">\n\u003cp>\u003cimg class=\"alignleft size-full wp-image-11944\" src=\"http://ww2.kqed.org/quest/wp-content/uploads/sites/39/2015/12/Climate-e-book-cover-1-150x194.png\" alt=\"Climate e-book cover 1\" width=\"105\" height=\"136\">\u003c/p>\n\u003cp>Look into the causes of climate change, and discover how scientists develop and use climate models.\u003c/p>\n\u003cp>\u003ca href=\"https://itunes.apple.com/ee/book/clue-into-climate-causes-change/id927517681?mt=13\">\u003cimg class=\"wp-image-11945\" src=\"http://ww2.kqed.org/quest/wp-content/uploads/sites/39/2015/12/Download_on_iTunes_Badge_US-UK_110x40_1004.png\" alt=\"Download on iBooks\" width=\"110\" height=\"40\">\u003c/a> \u003ca href=\"https://itunes.apple.com/us/course/clue-into-climate/id944516910\">\u003cimg alt=\"\">\u003c/a>\u003ca href=\"https://itunes.apple.com/us/course/clue-into-climate/id944516910\">\u003cimg src=\"http://ww2.kqed.org/quest/wp-content/uploads/sites/39/2015/12/E-book-button-for-Web.png\" alt=\"Subscribe on iTunes\" width=\"110\" height=\"40\">\u003c/a>\u003c/p>\n\u003c/div>\n\u003cdiv class=\"clearfix\">\n\u003cp>\u003cimg class=\"alignleft size-full wp-image-14724\" src=\"http://ww2.kqed.org/quest/wp-content/uploads/sites/39/2015/12/Climate-e-book-cover-2-150x194.png\" alt=\"Climate e-book cover 2 web\" width=\"105\" height=\"136\">\u003c/p>\n\u003cp>Learn about how climate change influences precipitation patterns and how it impacts our frozen landscape.\u003c/p>\n\u003cp>\u003ca href=\"https://itunes.apple.com/us/book/clue-into-climate-changing/id930719116?mt=13\">\u003cimg class=\"wp-image-11945\" src=\"http://ww2.kqed.org/quest/wp-content/uploads/sites/39/2015/12/Download_on_iTunes_Badge_US-UK_110x40_1004.png\" alt=\"Download on iBooks\" width=\"110\" height=\"40\">\u003c/a> \u003ca href=\"https://itunes.apple.com/us/course/clue-into-climate/id944516910\">\u003cimg alt=\"\">\u003c/a>\u003ca href=\"https://itunes.apple.com/us/course/clue-into-climate/id944516910\">\u003cimg src=\"http://ww2.kqed.org/quest/wp-content/uploads/sites/39/2015/12/E-book-button-for-Web.png\" alt=\"Subscribe on iTunes\" width=\"110\" height=\"40\">\u003c/a>\u003c/p>\n\u003c/div>\n\u003cdiv class=\"clearfix\">\n\u003cp>\u003cimg class=\"alignleft size-full wp-image-14735\" src=\"http://ww2.kqed.org/quest/wp-content/uploads/sites/39/2015/12/Climate-e-book-cover-3-150x194.png\" alt=\"Climate e-book cover 3 updated web\" width=\"105\" height=\"136\">\u003c/p>\n\u003cp>Investigate shifts in the distribution of plant and animal species due to climate change, and the effects of increased carbon dioxide emissions on the ocean.\u003c/p>\n\u003cp>\u003ca href=\"https://itunes.apple.com/us/book/clue-into-climate-changing/id932195900?mt=13\">\u003cimg class=\"wp-image-11945\" src=\"http://ww2.kqed.org/quest/wp-content/uploads/sites/39/2015/12/Download_on_iTunes_Badge_US-UK_110x40_1004.png\" alt=\"Download on iBooks\" width=\"110\" height=\"40\">\u003c/a> \u003ca href=\"https://itunes.apple.com/us/course/clue-into-climate/id944516910\">\u003cimg alt=\"\">\u003c/a>\u003ca href=\"https://itunes.apple.com/us/course/clue-into-climate/id944516910\">\u003cimg src=\"http://ww2.kqed.org/quest/wp-content/uploads/sites/39/2015/12/E-book-button-for-Web.png\" alt=\"Subscribe on iTunes\" width=\"110\" height=\"40\">\u003c/a>\u003c/p>\n\u003c/div>\n\u003cdiv class=\"clearfix\">\n\u003cp>\u003cimg class=\"alignleft size-full wp-image-14737\" src=\"http://ww2.kqed.org/quest/wp-content/uploads/sites/39/2015/12/Climate-e-book-cover-4-150x194.png\" alt=\"Climate e-book cover 4 web\" width=\"105\" height=\"136\">\u003c/p>\n\u003cp>See how communities are preparing for sea level rise and other impacts of climate change, and ways we can help minimize future climate change.\u003c/p>\n\u003cp>\u003ca href=\"https://itunes.apple.com/us/book/clue-into-climate-facing-our/id932658240?mt=13\">\u003cimg class=\"wp-image-11945\" src=\"http://ww2.kqed.org/quest/wp-content/uploads/sites/39/2015/12/Download_on_iTunes_Badge_US-UK_110x40_1004.png\" alt=\"Download on iBooks\" width=\"110\" height=\"40\">\u003c/a> \u003ca href=\"https://itunes.apple.com/us/course/clue-into-climate/id944516910\">\u003cimg alt=\"\">\u003c/a>\u003ca href=\"https://itunes.apple.com/us/course/clue-into-climate/id944516910\">\u003cimg src=\"http://ww2.kqed.org/quest/wp-content/uploads/sites/39/2015/12/E-book-button-for-Web.png\" alt=\"Subscribe on iTunes\" width=\"110\" height=\"40\">\u003c/a>\u003c/p>\n\u003c/div>\n\u003cdiv class=\"clearfix\">\u003c/div>\n\n","blocks":[],"excerpt":"In this interactive graphic, discover how carbon dioxide from the atmosphere mixes with the ocean making it difficult for shellfish to thrive. ","status":"publish","parent":0,"modified":1587659664,"stats":{"hasAudio":false,"hasVideo":true,"hasChartOrMap":true,"iframeSrcs":["https://www.youtube.com/embed/yH3E7Vs1Nj8"],"hasGoogleForm":false,"hasGallery":false,"hasHearkenModule":false,"hasPolis":false,"paragraphCount":24,"wordCount":612},"headData":{"title":"Ocean Acidification and Marine Life | KQED","description":"In this interactive graphic, discover how carbon dioxide from the atmosphere mixes with the ocean making it difficult for shellfish to thrive. ","ogTitle":"","ogDescription":"","ogImgId":"","twTitle":"","twDescription":"","twImgId":""},"disqusIdentifier":"73184 http://science.kqed.org/quest/?p=73184","disqusUrl":"https://ww2.kqed.org/quest/2014/12/12/ocean-acidification-and-marine-life/","disqusTitle":"Ocean Acidification and Marine Life","source":"Environment","sourceUrl":"https://ww2.kqed.org/quest/category/environment/","path":"/quest/73184/ocean-acidification-and-marine-life","audioTrackLength":null,"parsedContent":[{"type":"contentString","content":"\u003cdiv class=\"post-body\">\u003cp>\u003cp>Since the Industrial Revolution in the late 1700s, we have been mining and burning coal, oil and natural gas for energy and transportation. These processes release carbon dioxide (CO\u003csub>2\u003c/sub>) into the atmosphere. It is well established that the rising level of CO\u003csub>2\u003c/sub> in our atmosphere is a major cause of global warming. However, the increase in CO\u003csub>2\u003c/sub> is also causing changes to the chemistry of the ocean. The ocean absorbs some of the excess atmospheric CO\u003csub>2\u003c/sub>, which causes what scientists call \u003cstrong>ocean acidification\u003c/strong>. And ocean acidification could have major impacts on marine life.\u003c/p>\n\u003cp>\u003ciframe title=\"Ocean Acidification Video\" width=\"640\" height=\"480\" src=\"https://www.youtube.com/embed/yH3E7Vs1Nj8?feature=oembed\" frameborder=\"0\" allow=\"accelerometer; autoplay; encrypted-media; gyroscope; picture-in-picture\" allowfullscreen>\u003c/iframe>\u003c/p>\n\u003cp>\u003cem>Watch the video to see how ocean acidification is affecting some shelled marine organisms.\u003c/em>\u003c/p>\n\u003cp>What exactly is ocean acidification? Acidity is a measure of the concentration of hydrogen ions (H\u003csup>+\u003c/sup>) in a given solution. When CO\u003csub>2\u003c/sub> from the air mixes with ocean water it combines and forms carbonic acid (H\u003csub>2\u003c/sub>CO\u003csub>3\u003c/sub>). The carbonic acid then dissociates into hydrogen (H\u003csup>+\u003c/sup>) and bicarbonate (HCO\u003csub>3\u003c/sub>\u003csup>-\u003c/sup>) ions.\u003c/p>\n\u003cp>\u003cstrong>CO\u003csub>2\u003c/sub> (carbon dioxide) + H\u003csub>2\u003c/sub>O (water) → H\u003csub>2\u003c/sub>CO\u003csub>3\u003c/sub> (carbonic acid)\u003c/strong>\u003c/p>\n\u003cp>\u003c/p>\u003c/div>","attributes":{"named":{},"numeric":[]}},{"type":"component","content":"","name":"ad","attributes":{"named":{"label":"fullwidth"},"numeric":["fullwidth"]}},{"type":"contentString","content":"\u003cdiv class=\"post-body\">\u003cp>\u003c/p>\n\u003cp>\u003cstrong>H\u003csub>2\u003c/sub>CO\u003csub>3\u003c/sub> (carbonic acid) → H\u003csup>+\u003c/sup> (hydrogen ions) + HCO\u003csub>3\u003c/sub>\u003csup>-\u003c/sup> (bicarbonate) \u003c/strong>\u003c/p>\n\u003cp>This chemical reaction causes an increase in hydrogen ions in the seawater, thus increasing ocean acidity. The acidity of a solution is often reported in terms of pH. The pH scale ranges from 0 to 14. A value below 7 is acidic and a value above 7 is basic. The more acidic a solution, the higher the concentration of hydrogen ions and the lower the pH. There are many different ways to measure pH, ranging from litmus paper to sophisticated sensors.\u003c/p>\n\u003cp>Over the last several decades scientists have been measuring the levels of CO\u003csub>2\u003c/sub> and pH throughout the ocean. \u003ca href=\"http://www.pmel.noaa.gov/co2/file/Hawaii+Carbon+Dioxide+Time-Series\">Data\u003c/a> from these types of measurements show that as the concentration of CO\u003csub>2\u003c/sub> in the atmosphere increases, levels of CO\u003csub>2\u003c/sub> in the ocean also increase, increasing the levels of hydrogen ions and thus decreasing the pH of the ocean. This suggests that atmospheric CO\u003csub>2\u003c/sub> is contributing to the acidification of the ocean. It's important to note that the pH of the ocean is still basic (around a pH of 8), but scientists use the term ocean acidification to indicate the increase in hydrogen ions in the ocean, which lowers the ocean's pH.\u003c/p>\n\u003cp>Ocean acidification could have major impacts on the health and biodiversity of the ocean. For example, the increase in hydrogen ions in the ocean is making it harder for some marine invertebrates like corals, oysters and tiny sea snails to form their shells and grow. This has implications that extend throughout the marine food web.\u003c/p>\n\u003ch2>Discussion Questions\u003c/h2>\n\u003cul>\n\u003cli>What does the term ocean acidification mean?\u003c/li>\n\u003cli>Why is the ocean becoming more acidic?\u003c/li>\n\u003cli>If the pH of the ocean is still around 8, why do scientists use the term ocean acidification?\u003c/li>\n\u003cli>How does a decrease in ocean pH affect the ability of some marine organisms to build their shells?\u003c/li>\n\u003cli>What do you think are some possible effects of ocean acidification?\u003c/li>\n\u003c/ul>\n\u003chr>\n\u003cp>\u003c/p>\n\u003cp>\u003cstrong>An interactive version of this explainer is featured in our \u003cstrong>Clue into Climate\u003c/strong> e-book series. Click on the tabs below to download our free e-books and subscribe to our iTunes U course. You can also visit our \u003ca href=\"http://blogs.kqed.org/education/e-books/\">e-books page\u003c/a> to view our other offerings.\u003c/strong>\u003c/p>\n\u003cdiv class=\"clearfix\">\n\u003cp>\u003cimg class=\"alignleft size-full wp-image-11944\" src=\"http://ww2.kqed.org/quest/wp-content/uploads/sites/39/2015/12/Climate-e-book-cover-1-150x194.png\" alt=\"Climate e-book cover 1\" width=\"105\" height=\"136\">\u003c/p>\n\u003cp>Look into the causes of climate change, and discover how scientists develop and use climate models.\u003c/p>\n\u003cp>\u003ca href=\"https://itunes.apple.com/ee/book/clue-into-climate-causes-change/id927517681?mt=13\">\u003cimg class=\"wp-image-11945\" src=\"http://ww2.kqed.org/quest/wp-content/uploads/sites/39/2015/12/Download_on_iTunes_Badge_US-UK_110x40_1004.png\" alt=\"Download on iBooks\" width=\"110\" height=\"40\">\u003c/a> \u003ca href=\"https://itunes.apple.com/us/course/clue-into-climate/id944516910\">\u003cimg alt=\"\">\u003c/a>\u003ca href=\"https://itunes.apple.com/us/course/clue-into-climate/id944516910\">\u003cimg src=\"http://ww2.kqed.org/quest/wp-content/uploads/sites/39/2015/12/E-book-button-for-Web.png\" alt=\"Subscribe on iTunes\" width=\"110\" height=\"40\">\u003c/a>\u003c/p>\n\u003c/div>\n\u003cdiv class=\"clearfix\">\n\u003cp>\u003cimg class=\"alignleft size-full wp-image-14724\" src=\"http://ww2.kqed.org/quest/wp-content/uploads/sites/39/2015/12/Climate-e-book-cover-2-150x194.png\" alt=\"Climate e-book cover 2 web\" width=\"105\" height=\"136\">\u003c/p>\n\u003cp>Learn about how climate change influences precipitation patterns and how it impacts our frozen landscape.\u003c/p>\n\u003cp>\u003ca href=\"https://itunes.apple.com/us/book/clue-into-climate-changing/id930719116?mt=13\">\u003cimg class=\"wp-image-11945\" src=\"http://ww2.kqed.org/quest/wp-content/uploads/sites/39/2015/12/Download_on_iTunes_Badge_US-UK_110x40_1004.png\" alt=\"Download on iBooks\" width=\"110\" height=\"40\">\u003c/a> \u003ca href=\"https://itunes.apple.com/us/course/clue-into-climate/id944516910\">\u003cimg alt=\"\">\u003c/a>\u003ca href=\"https://itunes.apple.com/us/course/clue-into-climate/id944516910\">\u003cimg src=\"http://ww2.kqed.org/quest/wp-content/uploads/sites/39/2015/12/E-book-button-for-Web.png\" alt=\"Subscribe on iTunes\" width=\"110\" height=\"40\">\u003c/a>\u003c/p>\n\u003c/div>\n\u003cdiv class=\"clearfix\">\n\u003cp>\u003cimg class=\"alignleft size-full wp-image-14735\" src=\"http://ww2.kqed.org/quest/wp-content/uploads/sites/39/2015/12/Climate-e-book-cover-3-150x194.png\" alt=\"Climate e-book cover 3 updated web\" width=\"105\" height=\"136\">\u003c/p>\n\u003cp>Investigate shifts in the distribution of plant and animal species due to climate change, and the effects of increased carbon dioxide emissions on the ocean.\u003c/p>\n\u003cp>\u003ca href=\"https://itunes.apple.com/us/book/clue-into-climate-changing/id932195900?mt=13\">\u003cimg class=\"wp-image-11945\" src=\"http://ww2.kqed.org/quest/wp-content/uploads/sites/39/2015/12/Download_on_iTunes_Badge_US-UK_110x40_1004.png\" alt=\"Download on iBooks\" width=\"110\" height=\"40\">\u003c/a> \u003ca href=\"https://itunes.apple.com/us/course/clue-into-climate/id944516910\">\u003cimg alt=\"\">\u003c/a>\u003ca href=\"https://itunes.apple.com/us/course/clue-into-climate/id944516910\">\u003cimg src=\"http://ww2.kqed.org/quest/wp-content/uploads/sites/39/2015/12/E-book-button-for-Web.png\" alt=\"Subscribe on iTunes\" width=\"110\" height=\"40\">\u003c/a>\u003c/p>\n\u003c/div>\n\u003cdiv class=\"clearfix\">\n\u003cp>\u003cimg class=\"alignleft size-full wp-image-14737\" src=\"http://ww2.kqed.org/quest/wp-content/uploads/sites/39/2015/12/Climate-e-book-cover-4-150x194.png\" alt=\"Climate e-book cover 4 web\" width=\"105\" height=\"136\">\u003c/p>\n\u003cp>See how communities are preparing for sea level rise and other impacts of climate change, and ways we can help minimize future climate change.\u003c/p>\n\u003cp>\u003ca href=\"https://itunes.apple.com/us/book/clue-into-climate-facing-our/id932658240?mt=13\">\u003cimg class=\"wp-image-11945\" src=\"http://ww2.kqed.org/quest/wp-content/uploads/sites/39/2015/12/Download_on_iTunes_Badge_US-UK_110x40_1004.png\" alt=\"Download on iBooks\" width=\"110\" height=\"40\">\u003c/a> \u003ca href=\"https://itunes.apple.com/us/course/clue-into-climate/id944516910\">\u003cimg alt=\"\">\u003c/a>\u003ca href=\"https://itunes.apple.com/us/course/clue-into-climate/id944516910\">\u003cimg src=\"http://ww2.kqed.org/quest/wp-content/uploads/sites/39/2015/12/E-book-button-for-Web.png\" alt=\"Subscribe on iTunes\" width=\"110\" height=\"40\">\u003c/a>\u003c/p>\n\u003c/div>\n\u003cdiv class=\"clearfix\">\u003c/div>\n\n\u003c/div>\u003c/p>","attributes":{"named":{},"numeric":[]}}],"link":"/quest/73184/ocean-acidification-and-marine-life","authors":["10216"],"categories":["quest_4","quest_5","quest_9","quest_11766"],"tags":["quest_326","quest_621","quest_13098","quest_12946","quest_11194","quest_1585","quest_2035","quest_13106"],"collections":["quest_12656"],"featImg":"quest_73392","label":"source_quest_73184"},"quest_17484":{"type":"posts","id":"quest_17484","meta":{"index":"posts_1591205157","site":"quest","id":"17484","score":null,"sort":[1415890846000]},"guestAuthors":[],"slug":"the-sweet-science-of-chocolate","title":"The Sweet Science of Chocolate","publishDate":1415890846,"format":"video","headTitle":"QUEST | KQED Science","labelTerm":{"term":3354,"site":"quest"},"content":"\u003cp>\u003cem>This video story was originally produced by \u003ca href=\"http://ww2.kqed.org/quest/author/jennyoh/\">Jenny Oh\u003c/a> and was updated by \u003ca href=\"http://ww2.kqed.org/quest/author/lisalanders/\">Lisa Landers\u003c/a> and Arwen Curry.\u003c/em>\u003c/p>\n\u003cp>Chocolate is the solid gold of sweets, providing a standard of delectability that’s been upheld around the globe for more than 2,000 years. The ancient Mayans and Aztecs even used the pods of the cacao tree, which produces chocolate, as currency. They also used cacao as a tonic to improve overall health.\u003c/p>\n\u003cfigure id=\"attachment_72953\" class=\"wp-caption alignright\" style=\"max-width: 450px\">\u003ca href=\"http://ww2.kqed.org/quest/wp-content/uploads/sites/39/2014/11/Chocolate_McNeil_Guerra_Codex_FM_800.jpg\">\u003cimg class=\"wp-image-72953 size-medium\" src=\"http://ww2.kqed.org/quest/wp-content/uploads/sites/39/2014/11/Chocolate_McNeil_Guerra_Codex_FM_800-450x253.jpg\" alt=\"Drawing of cacao pods based on the The Codex Fejérváry-Mayer, an ancient Aztec manuscript. Courtesy Cameron McNeil and Eliud Guerra.\" width=\"450\" height=\"253\">\u003c/a>\u003cfigcaption class=\"wp-caption-text\">Drawing of cacao pods based on the The Codex Fejérváry-Mayer, an ancient Aztec manuscript.\u003cbr> Courtesy Cameron McNeil and Eliud Guerra.\u003c/figcaption>\u003c/figure>\n\u003cp>Today’s scientists agree with the ancients: chocolate, in small doses, is not just delicious -- \u003ca href=\"http://www.mayoclinic.org/healthy-living/nutrition-and-healthy-eating/expert-answers/healthy-chocolate/faq-20058044\">it’s actually good for you\u003c/a>. This is particularly true of dark chocolate, which is rich in compounds called flavanols. Also found in red wine, tea and berries, \u003ca href=\"http://healthyeating.sfgate.com/flavonoids-good-for-3158.html\">flavanols have an antioxidant effect\u003c/a>, reducing cell damage and heart disease. Research also strongly suggests that they support healthy blood pressure and reduce the chances of strokes and heart attacks.\u003c/p>\n\u003cp>“They’re really good at really scavenging or sopping up these free radicals that can damage your cells,” said Mary Engler, a senior clinician and training director at the National Institutes of Health, NINR, in Bethesda, MD. Engler has studied the health effects of chocolate and other flavonols since 2001.\u003c/p>\n\u003cfigure id=\"attachment_72949\" class=\"wp-caption alignleft\" style=\"max-width: 282px\">\u003ca href=\"http://ww2.kqed.org/quest/wp-content/uploads/sites/39/2014/11/Streeter_Pregnant_800.jpg\">\u003cimg class=\"size-thumbnail wp-image-72949\" src=\"http://ww2.kqed.org/quest/wp-content/uploads/sites/39/2014/11/Streeter_Pregnant_800-282x169.jpg\" alt=\"Pregnant women and their babies may benefit from eating small amounts of dark chocolate every day. Artwork by Katherine Streeter.\" width=\"282\" height=\"169\">\u003c/a>\u003cfigcaption class=\"wp-caption-text\">Pregnant women and their babies may benefit from eating small amounts of dark chocolate every day.\u003cbr>Artwork by Katherine Streeter.\u003c/figcaption>\u003c/figure>\n\u003cp>Pregnant women should take special note: Regular intake of chocolate -- the darker the better -- during pregnancy appears to \u003ca href=\"http://www.ncbi.nlm.nih.gov/pmc/articles/PMC2901253/\">lower the risk of pre-eclampsia\u003c/a>, a dangerous complication. A 2013 study at the University of Helsinki, Finland also showed that \u003ca href=\"http://news.bbc.co.uk/2/hi/health/3604275.stm\">women who eat chocolate every day during pregnancy report calmer, happier babies\u003c/a> six months after giving birth.\u003c/p>\n\u003cp>[ad fullwidth]\u003c/p>\n\u003cp>Milk and white chocolate lovers, you're out of luck: you’ll get all the butter, fat, and sugar, but \u003ca href=\"http://www.thelancet.com/journals/lancet/article/PIIS014067360761873X/fulltext\">no circulation-boosting flavanols\u003c/a>. Even dark chocolate is rich and should be eaten in moderation, and beware: some manufacturers artificially darken their product and remove the bitter cacao solids, which contain the healthy compounds.\u003c/p>\n\u003cfigure id=\"attachment_72948\" class=\"wp-caption alignright\" style=\"max-width: 300px\">\u003ca href=\"http://ww2.kqed.org/quest/wp-content/uploads/sites/39/2014/11/USDA_Infected_Cacao_k9542-2_800.jpg\">\u003cimg class=\"wp-image-72948 size-thumbnail\" src=\"http://ww2.kqed.org/quest/wp-content/uploads/sites/39/2014/11/USDA_Infected_Cacao_k9542-2_800-300x169.jpg\" alt=\"Scientist hope that advanced genomics will help to minimize cacao crop loss due to fungal disease, which has afflicted these pods in Costa Rica, causing them to rot on the tree. Photo by Christopher J. Saunders/USDA\" width=\"300\" height=\"169\">\u003c/a>\u003cfigcaption class=\"wp-caption-text\">Scientists are using advanced genomics to help minimize cacao crop loss due to fungal disease, which has afflicted these pods in Costa Rica, causing them to rot on the tree.\u003cbr> Photo by Christopher J. Saunders/USDA\u003c/figcaption>\u003c/figure>\n\u003cp>As beloved as it is, it’s not surprising that chocolate is an important crop for farmers around the world. Roughly 70 percent of cacao is produced in equatorial Africa, where two million small-scale farms depend on the crop. But cocoa production has long suffered from serious losses due to pests, drought and diseases. A third of the cocoa produced in Africa -- $800 million’s worth -- is lost each year.\u003c/p>\n\u003cp>Fortunately, there’s relief in sight for cacao farmers and the consumers who depend on them. In 2010, scientists at the USDA’s Agricultural Research Service and universities partnered with IBM and the candy company Mars to \u003ca href=\"http://www.ars.usda.gov/is/pr/2010/100915.htm\">se\u003c/a>\u003ca href=\"http://www.ars.usda.gov/is/pr/2010/100915.htm\">quence the genome of cacao\u003c/a>, in order to help identify the markers of a more sustainable crop.\u003c/p>\n\u003cfigure id=\"attachment_72947\" class=\"wp-caption alignleft\" style=\"max-width: 280px\">\u003ca href=\"http://ww2.kqed.org/quest/wp-content/uploads/sites/39/2014/11/Chocolate_TCHO_PeruPix-10-08-12_800.jpg\">\u003cimg class=\"wp-image-72947 size-thumbnail\" src=\"http://ww2.kqed.org/quest/wp-content/uploads/sites/39/2014/11/Chocolate_TCHO_PeruPix-10-08-12_800-280x169.jpg\" alt=\"A Peruvian cacao farmer with a batch of beans. Courtesy TCHO.\" width=\"280\" height=\"169\">\u003c/a>\u003cfigcaption class=\"wp-caption-text\">A Peruvian cacao farmer with a batch of beans. Courtesy TCHO.\u003c/figcaption>\u003c/figure>\n\u003cp>\u003c/p>\n\u003cp>The cacao genome sequence has been \u003ca href=\"http://www.cacaogenomedb.org/\">released for free on the internet\u003c/a>, where it can be accessed by researchers who can use it to improve cacao breeding techniques. Farmers can also use the cacao database to select the breeds that will flourish best under changing local conditions. And that’s sweet news for the future of one of the world’s favorite treats.\u003c/p>\n\n","blocks":[],"excerpt":"Everybody loves chocolate, but did you know that small daily doses of dark chocolate are good for your health? Read the story and watch the video to learn about the precision engineering and chemistry behind the beloved treat. ","status":"publish","parent":0,"modified":1442634495,"stats":{"hasAudio":false,"hasVideo":false,"hasChartOrMap":false,"iframeSrcs":[],"hasGoogleForm":false,"hasGallery":false,"hasHearkenModule":false,"hasPolis":false,"paragraphCount":11,"wordCount":612},"headData":{"title":"The Sweet Science of Chocolate | KQED","description":"","ogTitle":"","ogDescription":"","ogImgId":"","twTitle":"","twDescription":"","twImgId":""},"disqusIdentifier":"17484 http://science.kqed.org/quest/video/the-sweet-science-of-chocolate/","disqusUrl":"https://ww2.kqed.org/quest/2014/11/13/the-sweet-science-of-chocolate/","disqusTitle":"The Sweet Science of Chocolate","videoEmbed":"http://www.youtube.com/watch?v=WUwaidNGXaM?feature=player_detailpage","path":"/quest/17484/the-sweet-science-of-chocolate","audioTrackLength":null,"parsedContent":[{"type":"contentString","content":"\u003cdiv class=\"post-body\">\u003cp>\u003cp>\u003cem>This video story was originally produced by \u003ca href=\"http://ww2.kqed.org/quest/author/jennyoh/\">Jenny Oh\u003c/a> and was updated by \u003ca href=\"http://ww2.kqed.org/quest/author/lisalanders/\">Lisa Landers\u003c/a> and Arwen Curry.\u003c/em>\u003c/p>\n\u003cp>Chocolate is the solid gold of sweets, providing a standard of delectability that’s been upheld around the globe for more than 2,000 years. The ancient Mayans and Aztecs even used the pods of the cacao tree, which produces chocolate, as currency. They also used cacao as a tonic to improve overall health.\u003c/p>\n\u003cfigure id=\"attachment_72953\" class=\"wp-caption alignright\" style=\"max-width: 450px\">\u003ca href=\"http://ww2.kqed.org/quest/wp-content/uploads/sites/39/2014/11/Chocolate_McNeil_Guerra_Codex_FM_800.jpg\">\u003cimg class=\"wp-image-72953 size-medium\" src=\"http://ww2.kqed.org/quest/wp-content/uploads/sites/39/2014/11/Chocolate_McNeil_Guerra_Codex_FM_800-450x253.jpg\" alt=\"Drawing of cacao pods based on the The Codex Fejérváry-Mayer, an ancient Aztec manuscript. Courtesy Cameron McNeil and Eliud Guerra.\" width=\"450\" height=\"253\">\u003c/a>\u003cfigcaption class=\"wp-caption-text\">Drawing of cacao pods based on the The Codex Fejérváry-Mayer, an ancient Aztec manuscript.\u003cbr> Courtesy Cameron McNeil and Eliud Guerra.\u003c/figcaption>\u003c/figure>\n\u003cp>Today’s scientists agree with the ancients: chocolate, in small doses, is not just delicious -- \u003ca href=\"http://www.mayoclinic.org/healthy-living/nutrition-and-healthy-eating/expert-answers/healthy-chocolate/faq-20058044\">it’s actually good for you\u003c/a>. This is particularly true of dark chocolate, which is rich in compounds called flavanols. Also found in red wine, tea and berries, \u003ca href=\"http://healthyeating.sfgate.com/flavonoids-good-for-3158.html\">flavanols have an antioxidant effect\u003c/a>, reducing cell damage and heart disease. Research also strongly suggests that they support healthy blood pressure and reduce the chances of strokes and heart attacks.\u003c/p>\n\u003cp>“They’re really good at really scavenging or sopping up these free radicals that can damage your cells,” said Mary Engler, a senior clinician and training director at the National Institutes of Health, NINR, in Bethesda, MD. Engler has studied the health effects of chocolate and other flavonols since 2001.\u003c/p>\n\u003cfigure id=\"attachment_72949\" class=\"wp-caption alignleft\" style=\"max-width: 282px\">\u003ca href=\"http://ww2.kqed.org/quest/wp-content/uploads/sites/39/2014/11/Streeter_Pregnant_800.jpg\">\u003cimg class=\"size-thumbnail wp-image-72949\" src=\"http://ww2.kqed.org/quest/wp-content/uploads/sites/39/2014/11/Streeter_Pregnant_800-282x169.jpg\" alt=\"Pregnant women and their babies may benefit from eating small amounts of dark chocolate every day. Artwork by Katherine Streeter.\" width=\"282\" height=\"169\">\u003c/a>\u003cfigcaption class=\"wp-caption-text\">Pregnant women and their babies may benefit from eating small amounts of dark chocolate every day.\u003cbr>Artwork by Katherine Streeter.\u003c/figcaption>\u003c/figure>\n\u003cp>Pregnant women should take special note: Regular intake of chocolate -- the darker the better -- during pregnancy appears to \u003ca href=\"http://www.ncbi.nlm.nih.gov/pmc/articles/PMC2901253/\">lower the risk of pre-eclampsia\u003c/a>, a dangerous complication. A 2013 study at the University of Helsinki, Finland also showed that \u003ca href=\"http://news.bbc.co.uk/2/hi/health/3604275.stm\">women who eat chocolate every day during pregnancy report calmer, happier babies\u003c/a> six months after giving birth.\u003c/p>\n\u003cp>\u003c/p>\u003c/div>","attributes":{"named":{},"numeric":[]}},{"type":"component","content":"","name":"ad","attributes":{"named":{"label":"fullwidth"},"numeric":["fullwidth"]}},{"type":"contentString","content":"\u003cdiv class=\"post-body\">\u003cp>\u003c/p>\n\u003cp>Milk and white chocolate lovers, you're out of luck: you’ll get all the butter, fat, and sugar, but \u003ca href=\"http://www.thelancet.com/journals/lancet/article/PIIS014067360761873X/fulltext\">no circulation-boosting flavanols\u003c/a>. Even dark chocolate is rich and should be eaten in moderation, and beware: some manufacturers artificially darken their product and remove the bitter cacao solids, which contain the healthy compounds.\u003c/p>\n\u003cfigure id=\"attachment_72948\" class=\"wp-caption alignright\" style=\"max-width: 300px\">\u003ca href=\"http://ww2.kqed.org/quest/wp-content/uploads/sites/39/2014/11/USDA_Infected_Cacao_k9542-2_800.jpg\">\u003cimg class=\"wp-image-72948 size-thumbnail\" src=\"http://ww2.kqed.org/quest/wp-content/uploads/sites/39/2014/11/USDA_Infected_Cacao_k9542-2_800-300x169.jpg\" alt=\"Scientist hope that advanced genomics will help to minimize cacao crop loss due to fungal disease, which has afflicted these pods in Costa Rica, causing them to rot on the tree. Photo by Christopher J. Saunders/USDA\" width=\"300\" height=\"169\">\u003c/a>\u003cfigcaption class=\"wp-caption-text\">Scientists are using advanced genomics to help minimize cacao crop loss due to fungal disease, which has afflicted these pods in Costa Rica, causing them to rot on the tree.\u003cbr> Photo by Christopher J. Saunders/USDA\u003c/figcaption>\u003c/figure>\n\u003cp>As beloved as it is, it’s not surprising that chocolate is an important crop for farmers around the world. Roughly 70 percent of cacao is produced in equatorial Africa, where two million small-scale farms depend on the crop. But cocoa production has long suffered from serious losses due to pests, drought and diseases. A third of the cocoa produced in Africa -- $800 million’s worth -- is lost each year.\u003c/p>\n\u003cp>Fortunately, there’s relief in sight for cacao farmers and the consumers who depend on them. In 2010, scientists at the USDA’s Agricultural Research Service and universities partnered with IBM and the candy company Mars to \u003ca href=\"http://www.ars.usda.gov/is/pr/2010/100915.htm\">se\u003c/a>\u003ca href=\"http://www.ars.usda.gov/is/pr/2010/100915.htm\">quence the genome of cacao\u003c/a>, in order to help identify the markers of a more sustainable crop.\u003c/p>\n\u003cfigure id=\"attachment_72947\" class=\"wp-caption alignleft\" style=\"max-width: 280px\">\u003ca href=\"http://ww2.kqed.org/quest/wp-content/uploads/sites/39/2014/11/Chocolate_TCHO_PeruPix-10-08-12_800.jpg\">\u003cimg class=\"wp-image-72947 size-thumbnail\" src=\"http://ww2.kqed.org/quest/wp-content/uploads/sites/39/2014/11/Chocolate_TCHO_PeruPix-10-08-12_800-280x169.jpg\" alt=\"A Peruvian cacao farmer with a batch of beans. Courtesy TCHO.\" width=\"280\" height=\"169\">\u003c/a>\u003cfigcaption class=\"wp-caption-text\">A Peruvian cacao farmer with a batch of beans. Courtesy TCHO.\u003c/figcaption>\u003c/figure>\n\u003cp>\u003c/p>\n\u003cp>The cacao genome sequence has been \u003ca href=\"http://www.cacaogenomedb.org/\">released for free on the internet\u003c/a>, where it can be accessed by researchers who can use it to improve cacao breeding techniques. Farmers can also use the cacao database to select the breeds that will flourish best under changing local conditions. And that’s sweet news for the future of one of the world’s favorite treats.\u003c/p>\n\n\u003c/div>\u003c/p>","attributes":{"named":{},"numeric":[]}}],"link":"/quest/17484/the-sweet-science-of-chocolate","authors":["6444"],"categories":["quest_4","quest_5","quest_6","quest_3229","quest_12"],"tags":["quest_11124","quest_13081","quest_590","quest_641","quest_11122","quest_11123","quest_1122","quest_12269","quest_10557","quest_13201","quest_1436","quest_3351","quest_1751","quest_13078","quest_2141","quest_13082","quest_3711","quest_2349","quest_13","quest_13364","quest_13079","quest_2893","quest_13080","quest_3025","quest_13083","quest_3046","quest_3071"],"collections":["quest_3354"],"featImg":"quest_72976","label":"quest_3354"}},"programsReducer":{"possible":{"id":"possible","title":"Possible","info":"Possible is hosted by entrepreneur Reid Hoffman and writer Aria Finger. Together in Possible, Hoffman and Finger lead enlightening discussions about building a brighter collective future. 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Hosted by journalists of color, the show tackles the subject of race head-on, exploring how it impacts every part of society — from politics and pop culture to history, sports and more.\u003cbr />\u003cbr />\u003cem>Life Kit\u003c/em>, which will be in the second part of the hour, guides you through spaces and feelings no one prepares you for — from finances to mental health, from workplace microaggressions to imposter syndrome, from relationships to parenting. The show features experts with real world experience and shares their knowledge. Because everyone needs a little help being human.\u003cbr />\u003cbr />\u003ca href=\"https://www.npr.org/podcasts/510312/codeswitch\">\u003cem>Code Switch\u003c/em> offical site and podcast\u003c/a>\u003cbr />\u003ca href=\"https://www.npr.org/lifekit\">\u003cem>Life Kit\u003c/em> offical site and podcast\u003c/a>\u003cbr />","airtime":"SUN 9pm-10pm","imageSrc":"https://cdn.kqed.org/wp-content/uploads/2021/12/CodeSwitchLifeKit_StationGraphics_300x300EmailGraphic.png","meta":{"site":"radio","source":"npr"},"link":"/radio/program/code-switch-life-kit","subscribe":{"apple":"https://podcasts.apple.com/podcast/1112190608?mt=2&at=11l79Y&ct=nprdirectory","google":"https://podcasts.google.com/feed/aHR0cHM6Ly93d3cubnByLm9yZy9yc3MvcG9kY2FzdC5waHA_aWQ9NTEwMzEy","spotify":"https://open.spotify.com/show/3bExJ9JQpkwNhoHvaIIuyV","rss":"https://feeds.npr.org/510312/podcast.xml"}},"commonwealth-club":{"id":"commonwealth-club","title":"Commonwealth Club of California Podcast","info":"The Commonwealth Club of California is the nation's oldest and largest public affairs forum. 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