Chestnut Hill, Mass. (4/28/2021) — The vast frozen terrain of Arctic permafrost thawed several times in North America within the past 1 million years when the world’s climate was not much warmer than today, researchers from the United States and Canada report in today’s edition of Science Advances. Arctic permafrost contains twice as much carbon … Continue reading Cave deposits reveal Pleistocene permafrost thaw, absent predicted levels of CO2 release