OK, let me rephrase the question: Even if no one has ever done a rigorous calculation to produce specific numbers, has anyone ever offered even a qualitative guess as to what climate change would do to world population a century or so hence, if we were to imagine something on the more pessimistic side of predictions for the impact of climate change? OK, so it makes certain regions of the Earth unliveable. What does that mean, in practice? Birth rates fall, death rates rise, or just mass migration of people to more liveable regions where they have just as many babies as they'd have in their homeland?
Any way to guess which of those factors is dominant? Any way to even take a shot in the dark as to whether 2 or 3 or 4 C or whatever of warming is enough to impact world population in any notable way, or would it take much more than that to do anything?
I mean we have stuff like this talking about "human extinction" within a century because of climate change, and I'm wondering how alarmist that is, and what is the less alarmist version of that.
Worst case, Vostok Antartica will have pleasant temperatures.
