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In one of the planet’s coldest places, 130km south of Russia’s Arctic coast, scientist Sergey Zimov can find no sign of permafrost as global warming permeates Siberia’s soil. As everything from mammoth bones to ancient vegetation frozen inside it for millennia thaws and decomposes, it threatens to release vast amounts of greenhouse gases. Zimov, who has studied permafrost from his scientific base in the diamond-producing Yakutia region for decades, is seeing the effects of climate change in real time. Driving a thin metal pole meters into the Siberian turf, where temperatures are rising at more than three times the world average, with barely

Sakha yakutiyaRussia generalMaxim shemetovSergey zimovAlexander fedorovTom balmforthNikita zimovNature research scientificMelnikov permafrost institute in yakutskCarelton universityInternational permafrost associationIce ageClare baldwinSoviet unionNortheast science stationPleistocene park