Some Arctic ground no longer freezing—even in winter

Data from two Arctic sites suggest some surface layers are no longer freezing. If that continues, greenhouse gases from permafrost could accelerate climate change.

Ground collapses at Duvanny Yar, a permafrost megaslump along the Kolyma River in northern Siberia. New research suggests that some land in Arctic Alaska and Russia may no longer freeze at all. This constantly moving landslide, driven by erosion and sped up by warming temperatures, is an important research site for scientists, who use it to track what happens as carbon-rich land that has been frozen for centuries begins to thaw.
Photograph by Katie Orlinsky, National Geographic

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