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Some Arctic ground no longer freezing—even in winter

Some Arctic ground no longer freezing—even in winter

National Geographic - Craig Welch

Data from two Arctic sites suggest some surface layers are no longer freezing. If that continues, greenhouse gases from permafrost could accelerate climate change. Nikita Zimov was teaching students to do ecological fieldwork in northern Siberia when he stumbled on a disturbing clue that the frozen …

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