Selling green homes - and fuel Entrepreneurs are tapping into what could be the biggest economic opportunity of the 21st century: clean, money-saving technology. More
East River Hydropower Verdant Power is bolting giant turbines to the floor of New York's East River in the hopes of using the rushing tides to generate clean energy. A local grocery store is already using the power. More video
Putting the zoom into electric cars Watch out, Detroit. A new crop of electric-vehicle startups aims to put a dent in the Big Three by applying the latest in high-technology engineering and design. More
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