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How Obama plans to change how most of the country is powered

Flip a switch in America and there's a good chance that it's powered by coal. But on Friday President Obama took a giant stride toward changing that forever.

A Caterpillar Inc. front loader scoops coal from a mound at the Arch Coal Inc. Sentinel Prep Plant in Philippi, W.V., Jan. 13, 2016. (Photo by Luke Sharrett/Bloomberg/Getty)
A Caterpillar Inc. front loader scoops coal from a mound at the Arch Coal Inc. Sentinel Prep Plant in Philippi, W.V., Jan. 13, 2016. Bloomberg via Getty Images

Tony Dokoupil