Over a billion climate refugees?

That’s the result of the simulations in this just-published paper.¬†As you can see in the figure below, average wet-bulb temperatures will be rising over 31C (uncomfortable) and as high as 35C (fatal) under RCP4.5 (+2.25C, or action taken) or RCP8.5 (+4C, or business as usual).

The implication is that over 1 billion people will need to move somewhere else (the 2015 population of 1.71 billion for Bangladesh, India, Nepal, Pakistan and Sri Lanka is projected to reach 2.22 billion by 2050, using data from the UN), which is going to cause many political and economic complications.

H/T to DG