Expanding the study of prehistoric permafrost thawing to North America, researchers found evidence in mineral deposits from caves in Canada that permafrost thawing took place as recently as 400,000 ...

The left panel shows the near-surface permafrost extent (bluish area, overlaid on satellite imagery) estimated by the most commonly used pan-arctic map product for a site in Alaska. The right panel ...

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Chestnut Hill, Mass. (4/28/2021) -- The vast frozen terrain of Arctic permafrost thawed several times in North America within the past 1 million years when the world's climate was not much warmer than ...