At the Paris climate accord, world leaders promised to keep the global temperature increase this century (relative to pre-industrial levels) "well below 2 ˚C" and if possible below 1.5 ˚C. Many experts are skeptical about this goal being feasible, stating that even if all Paris targets are met, global warming may reach levels up to 3 ˚C above pre-industrial levels. Furthermore, with the coming departure of the United States from the agreement, the meeting of global targets may be in jeopardy.

It was previously asked whether global warming would exceed 2 ˚C. While this is the more interesting question out of a political perspective, given that world leaders have taken 2 ˚C to be their target, the more interesting question for humanity as a whole will be how much warming we will actually have.

How much greater (in ˚C) will the average global temperature in 2100 be than the average global temperature in 1880?