If Past Is a Guide, Arctic Could Be Verging on Permafrost Collapse
https://www.scientificamerican.com/article/if-past-is-a-guide-arctic-could-be-verging-on-permafrost-collapse/
Buried in frozen soil across the Arctic, billions of tons of carbon lies trapped in the ground. Just a few degrees of warming could unleash it into the atmosphere.
At least, that’s what the past would suggest. According to a new study, it’s happened before.