FILE - In this July 29, 2014, file photo, clean air advocates cheer as Mary Anne Hitt, director of the Sierra Club's Beyond Coal Campaign, speaks at a rally outside an Environmental Protection Agency hearing in Atlanta. Sierra Club lawyers who've preached against the environmental evils of coal-burning power plants for decades are trying to force the closure of the last significant one in renewable energy-rich Nevada with arguments based on a different sort of green: money. (AP Photo/David Goldman, File)
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