Coal Power Plant

Jim Cole/AP

In this Jan. 20, 2015 file photo, a plume of steam billows from the coal-fired Merrimack Station in Bow, N.H. President Barack Obama presented his final plan for carbon dioxide reduction targets on Monday, Aug. 3, 2015, which would reduce emissions 32 percent below 2005 levels by 2030. (AP Photo/Jim Cole, File)

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