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 ... more 
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) less 
1 / 30
Associated Press | Photo By Noah Berger
Tue, May 14, 2013 10:31 AM EDT