"Montana officials said Sunday that an oil pipeline breach spilled up to 50,000 gallons of oil into the Yellowstone River near Glendive, but they said they are unaware of any threats to public safety or health."

"MOAB, Utah — A different kind of spire is jutting into the iconic red rock vistas of Moab."

"A Republican lawmaker in Wyoming is taking a stand in favor of teaching climate science in the classroom."

"The city of Libby was home to a mine that blanketed residents in asbestos dust for decades. After years of cleanup, the Environmental Protection Agency now says most of the risk is gone."

"A coalition of activists on Tuesday protested outside the office of the federal Bureau of Land Management in Reno to decry an auction of huge tracts of public land for private oil and gas exploration that they claim damages the environment and guzzles water in a time of drought."

"BILLINGS, Mont. — A long-delayed risk study released Monday for a Montana mining town where hundreds of people have died from asbestos poisoning concludes cleanup practices now in place are reducing risks to residents."

"Federal wildlife managers on Friday declined to upgrade protections for a population of grizzly bears in the remote reaches of Idaho and northwest Montana that numbers fewer than 50, and which conservationists say are going extinct."

"Nearly 140 bison originally from Yellowstone National Park that were quarantined on a ranch owned by media mogul Ted Turner to create a herd free of a cattle disease will be transported late on Wednesday to an Indian reservation in Montana."