The Biden administration announced Thursday that it will end coal leasing on federal lands in the Powder River Basin, the single largest source of coal in the U.S., as the administration looks to limit greenhouse gas emissions, including from the dirtiest fossil fuel.

The decision was issued Thursday by the Interior Department’s Bureau of Land Management, and will ban leasing on more than 13 million public acres in the Powder River Basin, which spans Wyoming and Montana and accounts for nearly 50% of all U.S. coal production.