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Overviews of climate change science, solutions, and related topics, written by scientists and experts.

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A high riverbank on the left side of the photo is slumping and sliding into a river on the right side. Thin evergreen trees are visible in the background.
Explainer

Permafrost

Permafrost is ground that remains frozen for two or more years. The warming of the Arctic is thawing vast stretches of permafrost, creating a feedback loop that is accelerating climate change.
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