The 20th anniversary of the annual report tracks how sea ice, snow cover and many other vital signs of the Arctic have ...

Discover how Arctic animals survive extreme cold with special traits like thick fur, blubber and camouflage. Learn about top species mastering life below freezing.

From ramping up hot chocolate prices to threatening reindeer populations, global warming is taking a toll on the holiday ...

A natural experiment in a national park in Patagonia shows how the return of a large predator can reshape an ecosystem.

A population decline is continuing in one of North America’s biggest caribou herds, threatening hunting opportunities for ...

In Northwest Alaska, a proposed 211-mile mining road has divided an Inupiaq community already devastated by climate change.