Arctic region was permafrost-free when global temperatures were 4.5˚C higher than today, study reveals

PHYSorg
Jul 3, 2025, 1:18 pm505 ptsHotTop
Scientists have found evidence that the Asian continent was free of permafrost all the way to its northerly coast with the Arctic Ocean when Earth's average temperature was 4.5˚C warmer than today, suggesting that the whole Northern Hemisphere would have also been free of permafrost at the time.

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