Though still small potatoes compared to fossil fuels, renewable-energy technologies are experiencing explosive growth worldwide. Wind turbines, for example, are propagating at a greater rate than any other electricity-generating technology: global capacity surged 25 percent just last year. And Europe, with its high fossil fuel costs and generous government subsidies of "green power," is the epicenter of this growth, accounting for two-thirds of wind power facilities installed in 2003.

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