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FILE - In this July 1, 2013, file photo, smoke rises from the Colstrip Steam Electric Station, a coal burning power plant in in Colstrip, Mont. A seemingly divided Supreme Court on Wednesday weighed the Obama administration's first-ever regulations aimed at reducing power plant emissions of mercury and other hazardous air pollutants that contribute to respiratory illnesses, birth defects and developmental problems in children.  (AP Photo/Matthew Brown, File) Matt Brown/AP
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