Photos: Green tech in focus at MIT Energy 2.0 conference

Venture capitalist Vinod Khosla spoke at a "fireside chat," where he said solar thermal technologies--using the sun's heat to power generators--are underutilized. "We don't have an energy problem. We have a technology conversion problem. We need to get solar energy in a form we can use," he said.

Photo by Martin LaMonica/CNET News.com