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11 great green ideas

Entrepreneurs are risking their money to develop everything from hybrid vehicles to home solar-panel systems. Here are some of the best concepts.

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Road runner
Road runner
Steve Fambro was sick of people whizzing past him in the carpool lane, so he decided to do something about it. He set out to design a three-wheeled vehicle -- technically a motorcycle -- that would make it legal for him to drive alone in that lane and be cozy enough for daily commuting. With an infusion of $20 million from Idealab, Bill Gross's business incubator, Fambro's company, Aptera, is scheduled to begin production of the $30,000 electric hybrid later this year. -- Telis Demos

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Last updated April 21 2008: 9:03 AM ET