"The most climate-stressed regions all contained permafrost, which is vulnerable to thaw as temperatures rise," researcher Sue Natali said.

The extensive northern forests of Canada, Alaska and Siberia are about to fundamentally ... data from satellites to model future shifts. Boreal forests encircle the cold, northern regions of ...

Approximately 99% of the Eurasian tundra region experienced significant warming, compared to 72% of Eurasian boreal forests ... including Alaska's Yukon-Kuskokwim Delta and central Canada.