Investors see green in clean tech
 

"I can't tell you how many young entrepreneurs we see coming up who are still doing software. We're seeing phenomenally talented people starting software companies with real innovation," said Kertzman, a partner at Hummer Winblad Venture Partners, which invests only in software companies.

"But people who have made their mark and made their fortunes, yes, they are looking at new interesting things like environmental tech, biotech or nano," he said.

Still, the lure of promising technologies that can generate both a financial return and improve the environment is a strong draw.

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