An xkcd-style chronology of the Earth's average temperature and what happens from -4 ° C to + 4 ° C

It is appropriate to recover these very long Chronology of the average temperature

 of the Earth since the last glaciation (~ 20,000 BC) until today. 

In it xkcd explains with its usual grace what happens when the temperature of the 

planet varies between -4 ° C to + 4 ° C.

The original is vertically almost infinite, but entertaining to see in detail.

 We already know how this ends, although we may still be in time that in the next

 decades the thing will be reversed and return to reasonable levels like 

those before the Industrial Revolution.

 Hacker News