LAS VEGAS, NV - AUGUST 13: U.S. Secretary of the Interior Sally Jewell delivers a keynote address during the National Clean Energy Summit 6.0 at the Mandalay Bay Convention Center on August 13, 2013 in Las Vegas, Nevada. Political and economic leaders are attending the summit to discuss a domestic policy agenda to advance alternative energy for the country's future. (Photo by Ethan Miller/Getty Images)
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