Green energy is making big money

Worldwide sales for companies specializing in biofuels, wind farms, solar panels and fuel cells grew 40 percent in 2007 to reach $77.3 billion, according to an annual report issued Tuesday by Clean Edge, a research firm that studies the green technology industry.

That’s significant revenue for an industry crowded with startups, many of which don’t yet have finished products to sell. But other companies – including major corporations such as General Electric – have waded into the field, selling their wind turbines and solar panels around the globe.

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