Polar bears that hunt from freshwater ice in Southeast Greenland are "the most genetically isolated population of polar bears anywhere on the planet."

Sea ice around Antarctica retreats more quickly than it advances, an asymmetry that's puzzled scientists. New research suggests it's actually pretty simple.

Narwhals are facing a new enemy in the Arctic. Noise from ships, mine blasts, and seismic surveys stress them out, even when it comes from miles away.

Sea ice is thinning at an alarming rate. Snow is shifting to rain. And humans worldwide are increasingly feeling the impact of what happens in the seemingly distant Arctic.

Killer whales are spending more time lingering in parts of the Arctic Ocean that are increasingly ice-free.

A closer look at how ice cover changed through the months offers some important insights into the role of climate change and why every year isn’t a record.

Some of the climate changes will be irreversible for millennia. But some can be slowed and even stopped if countries quickly reduce their greenhouse gas emissions, including from burning fossil fuels.

A particularly stormy winter has pushed perennial sea ice into the Arctic melt zone.

Emperor penguins survive in a ‘Goldilocks zone’ between too much sea ice and too little. A new study shows the risk they face from climate change.