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Author: William Yardley

A depot used to store pipes for Transcanada Corp's planned Keystone XL oil pipeline is seen in Gascoyne, North Dakota November 14, 2014. REUTERS/Andrew Cullen
For decades, the Crow Nation has relied on the Absaloka coal mine, an important supplier of fuel to power plants in the Midwest, for the bulk of its revenue. But the mine's output has been declining in part because it produces a lower-grade, higher-polluting coal. (Barbara Davidson/Los Angeles Times/TNS)
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