Climate Change

The director of an Oregon avalanche awareness and educational center was killed earlier this week by an avalanche.

The average global atmospheric carbon dioxide level stood increased by the largest annual amount observed in 56 years of record-keeping.

Canadian Prime Minister Justin Trudeau and President Obama are ushering in a new era of cooperation on climate change and the Arctic.

Storms are hammering the West Coast and the South, with more rain to come in both regions due to the same phenomena: atmospheric rivers.

Extreme weather will hit the U.S. hard this week, with potentially deadly flooding in several states. Meanwhile, Mexico City could see snow.

A record warm winter in Alaska is leading to some desperate attempts to save the iconic Iditarod sled dog race.

Honduran indigenous leader Berta Cáceres, respected for her outspoken environmental activism, was shot and killed on Thursday.

The parade of "Pineapple Express" storms Californians have been waiting for this weekend is about to begin.

The sky put on a show of rare, rolling undulatus asperatus clouds over Alabama on Thursday.

Winter seems to have skipped this year in the Arctic, where sea ice hit another record low during February.

DiCaprio is more than just a hard-partying Oscar winner -- he's one of the most committed environmental activists in Hollywood.

The drought in the Levant region from 1998 to 2012 was the most severe in at least 900 years.

"Change air pollution before it changes you."

The next few weeks are critical as the Great Barrier Reef, along with reefs around the world, faces what authorities have called the longest-ever coral bleaching event on record.

The center of Tokyo now looks more like a sea of yellow than a major metropolis.

New research suggests that the global community may need to do more to make sure its most vulnerable populations are being protected.

They were in search of food.

When your cause is the future of humanity, sometimes muscle cramps and sore feet cease to matter so much.

Thanks to record-breaking rains last year, one of Earth's hottest and driest spots is now awash in sea of yellow wildflowers.

The "sea butterfly" is a zooplankton snail that behaves more like an insect, and its movement may pave the way for a fleet tiny underwater robots.

Human-caused global warming has led to a huge spike in coastal flooding events in the U.S., which may get much worse as the climate warms.

Tropical Cyclone Winston slammed into Fiji as the strongest such storm ever observed in the southern hemisphere, and one of the strongest in the world.

Extremely intense Tropical Cyclone Winston is on course to make a direct hit on Fiji's capital this weekend.

One of the leading figures who helped craft the landmark Paris Agreement on climate change is stepping down from her post.

The Obama administration is paying to relocate a native tribe whose land is sinking beneath the rising seas of the Gulf of Mexico.