Scientists are debating whether, facing a global warming catastrophe, we should take radical measures to cool the planet, such as blasting huge amounts of sulfur into the atmosphere to deflect light away from Earth. We take up the moral, political and scientific challenges of geoengineering.

Ken Caldeira, climate scientist at the Carnegie Institution's Department of Global Ecology at Stanford University
Martin Bunzl, professor of philosophy at Rutgers University and director of the Rutgers Initiative on Climate and Social Policy

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