sage grouse

 
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  Grousing at windmills

A rare dispute between environmentalists and renewable energy advocates has broken out in Wyoming, where wind energy development threatens the fragile habitat of the sage grouse.

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  The most powerful environmental law on the books

Need to Know talked with David Skelly, professor of ecology at Yale University about the power of the Endangered Species Act and how fear of its consequences has produced some reluctant conservationists.

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