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In this April 4, 2013, file photo, a dragline excavator moves rocks above a coal seam at the Spring Creek Mine in Decker, Mont. President Donald Trump says withdrawing from a global climate change agreement will boost the U.S. economy but existing market forces have had far more of an effect on the fossil fuel industries than climate regulations. For at least three years now, the coal industry has been reeling from growing competition from natural gas, wind and solar power. (Photo by Matthew Brown/AP Photo)
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