In his Oval Office speech on the BP disaster Tuesday night, President Obama was expected to call for action on legislation to move the nation away from fossil fuel dependence. But how close are we to having viable, cleaner alternatives? In California, utilities are struggling to meet the state’s goal that they provide one-third of their power from renewable resources by 2020. We look at the most promising developments in the world of alternative energy — and at some of the obstacles to large-scale adoption.

Dan Kammen, professor of energy at UC Berkeley and co-director of the Berkeley Institute of the Environment
Craig Miller, senior editor of KQED's Climate Watch
Ted Nordhaus, chairman of the Breakthrough Institute, a political think tank based in Oakland that works on climate, energy and economic policy issues, and author of "Break Through: Why We Can't Leave Saving the Planet to Environmentalists"
Michael Picker, senior adviser for Renewable Energy Facilities for Governor Arnold Schwarzenegger

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