Several parts of our planet are critically sensitive, such as the Arctic summer sea ice, the ice cover of Greenland, the boreal forests of Canada and Russia, and the tropical forest cover of the Amazon. They have been maintaining a stable temperature on Earth for millennia.2 If those ecosystems were to go up in flames or be otherwise compromised, global temperature would rise precipitously, leading to irreparable worldwide damage. Think of this as an uncontrollable domino effect of devastation.
