BILLINGS, Mont. (AP) — A federal judge in Montana has given the Trump administration until late 2019 to analyze reductions to mining in the nation's most productive coal fields as a way to fight climate change.

The order from U.S. District Judge Brian Morris, issued Tuesday, applies to the Powder River Basin of Montana and Wyoming. The region supplies about 40 percent of the nation's coal, much of it from massive strip mines on public lands.

The case involves a challenge by environmentalists of U.S. Bureau of Land Management plans issued in 2015 to lease more than 10 billion tons of coal in th...