Windmills lining the Altamont Pass generate electricity on Sunday, May 12, 2013, near Livermore, Calif. It's the not-so-green secret of the nation's wind-energy boom: Spinning turbines are killing thousands of federally protected birds, including eagles, each year. (AP Photo/Noah Berger)

Associated Press
Windmills lining the Altamont Pass generate electricity on Sunday, May 12, 2013, near Livermore, Calif. It's the not-so-green secret of the nation's wind-energy boom: Spinning turbines are killing thousands of federally protected birds, including eagles, each year. (AP Photo/Noah Berger)
Windmills lining the Altamont Pass generate electricity on Sunday, May 12, 2013, near Livermore, Calif. It's the not-so-green secret of the nation's wind-energy boom: Spinning turbines are killing thousands of federally protected birds, including eagles, each year. (AP Photo/Noah Berger)
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