GILLETTE, Wyo. (AP) — This hardscrabble Wyoming city of about 30,000 people proclaims itself the "Energy Capital of the Nation" on the mayor's blue blazer and even the parking ticket payment boxes.

Nearby are some of the world's largest open-pit mines, where dump trucks the size of houses haul out more than 40 percent of the coal produced in the U.S. The windy, wide-open landscape around Gillette also has substantial reserves of natural gas, oil and uranium.

So when President Donald Trump lifted a federal coal leasing moratorium and ordered a review of greenhouse gas regulations, the announcem...