A green credit card promises to fight against global warming with carbon offsets. What are these offset projects and how good are their claims?

Billions of dollars are pouring into the search for a new generation of eco-friendly bio-fuels. Three young Berkeley entrepreneurs say they may have found the answer in an unusual source.

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Reporter Anna Sussman describes her visit to a remote village in Uganda that's on the frontline of the booming global carbon trade

Investors Dan Lankford and Marianne Wu talk about venture capital and its role in the green-tech economy.

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Green Rush was supported in part by the Kendeda Sustainability Fund of the Tides Foundation and the Comer Science and Education Foundation.