Microbes across Earth's coldest regions are becoming more active as glaciers, permafrost and sea ice thaw, accelerating ...

Polar bears need fat to survive the harsh Arctic cold; that’s why they eat blubbery seals. Seals, meanwhile, need ice to rest ...

Polar bears are the poster children of climate change—and for good reason. Researchers took more than 1,000 body measurements ...

An unusually brutal winter storm is set to pummel more than 160 million Americans from Friday, as a stretched "polar vortex" sends a devastating blast of Arctic air, bringing heavy snows and freezing ...

Polar bears in one of the fastest-warming parts of the Arctic are showing clear changes in how their DNA behaves, according to a new study. Researchers examined genetic activity in polar bears from ...

A population of bears in Norway’s Arctic is confounding scientists’ expectations, getting fatter and healthier even as the sea ice melts rapidly.

Last year, the United Nations predicted that Earth’s average temperature could rise more than 5.4 degrees Fahrenheit (3 degrees Celsius) by 2100 if we don’t reduce global emissions. That level of ...

Rapid changes in climate in the polar regions are causing observable ecological impacts of various types and degrees of severity at all ecosystem levels. Even larger changes and more significant ...

Remarkably, the number of days with no ice in the region increased by roughly 100 during that period. And yet, as the authors found, the body condition of both male and female polar bears—i.e., how ...