"Nevada should accept a federal plan to add an abandoned copper mine near Yerington to the Superfund National Priority List — a move that would designate it as one of the nation's most polluted sites and bring federal funds to cover 90 percent of the cleanup, U.S. Sen. Harry Reid said."

"Wild bison will be allowed to migrate out of Yellowstone National Park and stay in parts of Montana year-round under a Tuesday move by Gov. Steve Bullock that breaks a longstanding impasse in a wildlife conflict that's dragged on for decades."

"Wildlife advocates reached a tentative agreement with the U.S. government in a legal dispute over an endangered fish in the Yellowstone River along the Montana-North Dakota border."

"Leo Garcia hadn't heard of trichloroethylene about four decades ago when he moved into his red-and-white house just west of Cheyenne."

"CHEYENNE, Wyo. — A federal judge is set to hear the state's request to dismiss a lawsuit filed by groups challenging Wyoming laws enacted this year that restrict data collection on open land."

"Emission controls required on out-of-state power plants have yielded big reductions in mercury pollution in Western Maryland's air, a study has found. So far, however, the state's fish remain as contaminated with the toxic chemical as ever, researchers say."

"The shaggy offspring of the United States' only wild, purebred herd of bison are pitting Montana conservationists, federal wildlife managers, ranchers and Native American tribes against each other."

"Colorado's agricultural agencies are in panic mode after several independent studies found dangerous levels of pesticides in marijuana products."

"The Interior Department plans to cancel a long-suspended oil and gas drilling lease near Glacier National Park that's on land considered sacred to the Blackfoot tribes of the U.S. and Canada, according to court documents filed Monday."