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Rail cars are filled with coal and sprayed with a topper agent to suppress dust at Cloud Peak Energy's Antelope Mine north of Douglas, Wyo. 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. (Ryan Dorgan/The Casper Star-Tribune via AP, File)

Closer look: How will Trump’s climate proposals affect the coal industry?

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