HEALY, ALASKA—Bitter winters still dominate life in the Alaskan interior, but a practiced eye can spot the signs of a warming climate, particularly in the ground. Beneath the rolling fields of tussock scattered just north of the Alaska Range, what was once permanently frozen is starting to thaw. The impacts could ripple across the planet.

Sea salt around the world has been contaminated by plastic pollution, adding to experts’ fears that microplastics are becoming ubiquitous in the...

Residents are now being asked to stay away from Nahanni Butte, N.W.T., after being forced out Thursday night by a forest fire burning close to the community.

Community concerned about health and safety from old site.

Environment Canada says these smoky conditions could remain until Wednesday.

Russian River flooded last week in Kodiak leaving some residents scrambling to address the damage.

The smoke from massive wildfires hangs like fog over large parts of the U.S. West, an irritating haze causing health concerns, forcing sports teams to change schedules and disrupting life from Seattle to tiny Seeley Lake, Montana.

Los Angeles County's La Tuna Fire is one of 29 burning across the state, and "is the largest fire in the history of L.A. city," Mayor Eric Garcetti said.

The Canadian Red Cross says an additional 1,500 people from the Garden Hill First Nation in Manitoba have been given evacuation orders due to wildfire smoke in the Island Lake area.

UPDATE 3:55 P.M. With assistance from several supporting agencies, the Kittitas County Sheriff’s Office completed evacuation notices mid-day Saturday in the Roslyn, Ronald and Lake Cle Elum areas.

Study finds Zoloft, Celexa, Prozac and Serafem in multiple Great Lakes fish species — possibly changing their behavior and impacting the ecosystem

A new report identifies climate change as one of the challenges facing transportation in Alaska's most famous national park.

According to the National Weather Service, 36.5 million residents, 98% of Californians, are under a heat advisory Friday as a high-pressure system broils the state from the Oregon to Mexico borders.

Maps and graphics show the extent of the devastating flooding caused by Hurricane Harvey in Houston and Texas.

The devastating storm once known as Hurricane Harvey, already the biggest rainstorm in the history of the continental United States, delivered another punishing wave of rain Wednesday to Texas and Louisiana.

Harvey has been devastating beyond Houston. Here's the latest.

The storm is not expected to relent until Wednesday afternoon.

For the past several weeks, monsoon-triggered floods have devastated regions in Nepal, Bangladesh and India. This week, a new series of storms has brought everyday life in Mumbai to a near halt.

Looking around the deserted plaza in front of the Sandman Centre arena in Kamloops on Monday, it’s hard to believe that last month it was crammed with thousands of people who were looking for help after being forced from their homes by wildfires.

Several factors have conspired to make Hurricane Harvey so destructive in Texas, and warming temperatures are likely part of the problem.