![]() Global warming is thawing swathes of the world's permafrost, threatening to release vast amounts of greenhouse gases as everything from mammoth bones to ancient vegetation that have laid frozen inside it for millennia defrost and decompose. Sergey Zimov, 66, a scientist who works at Russia's Northeast Science Station, checks for permafrost at the Pleistocene Park outside the town of Chersky, Sakha (Yakutia) Republic, Russia, September 13, 2021.
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