Here are a few things that caught my ear at EMTech08 and my thoughts about them.
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.
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.
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.