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Here are a few things that caught my ear at EMTech08 and my thoughts about them.
With all the money going into clean tech, people understandably worry about an investment bubble. But the later-stage "funding gap" is a bigger barrier to success.
A panel of experts argue that a combination of clean transportation technologies, from biofuels to battery-powered cars, is the most likely path to greener cars.
Investor Vinod Khosla says radical clean tech is needed for climate change. Technology pathways that lead to dramatic change will work; others are a dead end.