GREEN

Windmills: Why Are They All White With Three Blades?

06/30/2010 05:12 am ET | Updated May 25, 2011

The federal government has green-lighted the nation's first offshore wind farm, to be built off the coast of Cape Cod, Mass. Opponents claim that 130 white, three-bladed turbines will detract from the natural beauty of Nantucket Sound. Why do all modern windmills look the same?

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