FORTUNE -- Having helped both create the Java programming language and co-found Sun Microsystems, Bill Joy is best known as a technologist and entrepreneur. He hopes to add environmentalist to that list.
As a partner at leading venture capital firm Kleiner Perkins, Joy is devoting much of his time to overseeing Kleiner's portfolio of nearly 60 green start-ups. He spoke at Fortune's Brainstorm Green conference about what green technologies he believes are most likely to work, and why.
Joy is a believer in wind, or perhaps more accurately, micro-wind. The big problem with wind power to date, he said, is that small windmills cost far more per watt generated than do large wind farms with giant turbines and huge blades—sometime ten times as much. "The smaller wind gets the more expensive it gets," Joy said. More
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