"Cleantech investing is mostly large in scale, large in risk and large in potential rewards, " Dolezalek says.
FORBES: Magazine Article
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"I don't think you're going to see as many successful companies in cleantech compared with Internet and software, " Dolezalek says.
FORBES: Seeing Green In Cleantech
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Demonstrating consistent revenue growth and profits takes most such companies five to eight years, says Stephan Dolezalek, a managing director at VantagePoint Venture Partners.