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.

Emperor penguins survive in a ‘Goldilocks zone’ between too much sea ice and too little. Global warming is raising risks.

Emperor penguins survive in a ‘Goldilocks zone’ between too much sea ice and too little. Global warming is putting their chicks at risk and setting almost every colony on a path toward extinction.

The world's ice is shrinking by 33,000 square miles a year, according to the first ever global asessment of the Earth's cryosphere.

An area once considered to be a potential last refuge for ice-dependent animals in the Arctic is already showing signs of ice loss.

Almost all the world's glaciers, about 220,000 in total, are are rapidly becoming thinner and losing mass, a new study shows.

Russia is attempting to claim more of the Arctic seabed – an area rich in oil, gas and minerals – and its fleet of icebreakers is helping shipping expand. The US needs some creative ideas to catch up.

Just like rings in a tree trunk, a narwhal's tusks offer clues to climate change. A new study of tusks show a sharp rise in mercury in the Arctic.

Researchers have found a molecule in algae follows the ebbs and flows of sea ice. That could let them reconstruct past ice to shed light on climate change.

Warm, moist rivers of air have a lot to do with massive holes in sea ice in Antarctica's Weddell Sea, a new study shows.