Nick Mott

Authorities have been unable to find the bear that killed a woman near Yellowstone National Park late last month. The attack has renewed calls to take grizzlies off the endangered species list.

States neighboring Yellowstone National Park have eased rules on hunting wolves, resulting in the most being killed in nearly a century

Last year, two neighboring states loosened restrictions on hunting wolves outside Yellowstone, resulting in a spike in deaths. Locally that's politically popular, but biologists see problems.

Big wildfires create their own weather, and can even spawn tornadoes swirling with smoke and flame. Researchers are trying to determine how often they occur.

Researchers who study evidence of fires through the millennia say to expect more and bigger fires as the climate continues to warm. Fire season is already months longer than in the 1970s.

Medical staff are liaisons to the sick and dying for relatives not allowed at bedsides. The emotional toil at one Montana hospital is a case study of what caregivers are grappling with across the U.S.

The Trump administration is stripping clean water protections put in place by President Barack Obama, and some in the industry worry that the regulatory changes will threaten their business.

Montana property owners are suing BP to clean up arsenic pollution left over from mining. The case is now before the U.S. Supreme Court, and businesses worry it could open them up to huge new costs.

Hikers and hunters have long relied on horses, mules and llamas to carry gear on long backcountry trips. Now, many are getting into goats. Many say they're superior, but critics see risks to wildlife.

A healthy population of grizzlies in and around Glacier National Park means the bear may come off the endangered species list. But more bears mean more confrontations with humans.