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Running your car on green slime?

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Exxon announced that it will spend $600 million on technology to derive renewable fuels from green algae, a biotechnology that could potentially transform the petroleum industry. They've tapped geneticist Craig Venter and his company Synthetic Genomics. But will it really be economical? And are there new potential environmental hazards from this kind of fuel source? Larry Mantle finds out more about the announcement. Add your thoughts here.

Daniel Kammen, Director of the Renewable and Appropriate Energy Laboratory at UC Berkeley

Kert Davies, research director at Greenpeace