Polar vortex is not a synonym for “cold snap,” according to the Polar Vortex Blog at Climate.gov, and it’s not the only weather pattern to blame for blasts of cold air.

The polar vortex is a large area of low pressure and cold air surrounding both of the Earth’s poles. It’s typically held in place by strong westerly winds known as the polar jet stream.

A new study challenges the idea that climate change is behind the erratic wintertime behavior of the polar jet stream, the ...

A polar bear chased residents near a school in a small Alaska village last week, killing a mother and her 1-year-old son before another resident shot the bear dead, state troopers said. Polar bear ...

As climate change diminishes sea ice from coastal communities in the Arctic and the subarctic, researchers expect polar bears to range farther into the towns and camps in that remote part of the ...

The impacts of human-caused climate change are so overwhelming they’re actually messing with time, according to new research.. Polar ice melt caused by global warming is changing the speed of ...

Looking back on more than 20 years of climate agitation, two themes emerge: a stubborn unwillingness by campaigners to acknowledge any inconvenient science, and ever-shifting favorite stories, firs… ...

For polar bears, the climate change diet is a losing proposition, a new study suggests. With Arctic sea ice shrinking from climate change, many polar bears have to shift their diets to land during ...

The impacts of human-caused climate change are so overwhelming they’re actually messing with time, according to new research.. Polar ice melt caused by global warming is changing the speed of ...

FILE - A male polar bear eats a piece of whale meat as it walks along the shore of Hudson Bay near Churchill, Manitoba, Aug. 23, 2010. With Arctic sea ice shrinking from climate change, many polar ...

When polar bears have sea ice, they feast on seals. Not just the seals, but their fat. About 70% of the polar bear diet while on ice is fat, said study co-author Karyn Rode, a USGS wildlife biologist.