Comment It doesn't stop in 2100 (Score 2) 71
All these predictions are for what will happen by 2100, but that's just an arbitrary date. Once we push the system too far, the feedbacks take over and it becomes unstoppable. At that point, even if we completely stop burning fossil fuels, CO2 keeps increasing, permafrost keeps thawing, ice keeps melting, forests keep dying, and the planet keeps heating. The eventual result is that the earth transitions back to a hothouse state (its normal state for most of the last few hundred million years), about 6C hotter than what humans evolved under. It'll take centuries, but it will be unstoppable.
We don't know exactly how long we have before it becomes unstoppable, but not long. Possibly only a few decades.