Environment & Energy

It is highly unlikely that the temperature alone will do in civilization. That will happen due to extreme weather events in food producing regions. The probability of such events occurring continues to increase. A 2C increase in temperature doesn't guarantee such devastating effects, it just raises the likelihood. That likelihood, though smaller, still exists at 1.5C -which is where we were last year. While such a catastrophe is still unlikely, it has still never been more likely than it is now.

One year with food producing regions being devastated really is all it will take to unravel civilization. The poor nations will starve. The rich nations will face price inflation of food prices that haven't been seen on a global scale ever, likely resulting in riots and widespread political instability.

The upshot of all of that is that we may have plenty of time to prepare, or none at all. And not a person on Earth can tell you with any real confidence which is closer to correct.