A 770,000-year-old mystery is not something you stumble across every day, and it's making these researchers reconsider some things.

From unstable slopes to rock falls, thawing permafrost will have many consequences for mountain regions, including the Swiss ...

Permafrost is soil, rock, or sediment that remains frozen for two or more consecutive years. It is found in high-latitude regions, such as the Arctic, Alaska, Siberia, and parts of Canada ...

Permafrost was on its way out. A few hundred beavers won’t reengineer the Arctic. But the animals may be heading north in Canada and Siberia too, and they reproduce quickly. Argentina’s ...