Why the return of the mammoth may be crucial to reverse global warming

Russian scientists Sergey Zimov and Nikita Zimov believe they can slow the thawing of the Siberian permafrost, that contains vast amounts of carbon dioxide and methane, by bringing back grazing animals to a swath of land called Pleistocene Park. “When animals trample down the snow, they actually thin that layer of snow, making it dense, and this allows much deeper freezing during winter,” they say.

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