> The bottom-end of "human's as a species still exist" is not an existence you are familiar with or want, and is worse then what our hunter-gatherer forebears had to deal with.
No, but that's the case even now. The bottom end of humanity is having a horrible time. I'm sure people in North Korea or the war-torn countries in Africa won't be that much worse off than they are now.
> Rather makes a lot of assumptions that the "no longer supportable" population will simply gracefully starve to death and leave the lucky ones be in the interim.
I agree think it will lead to conflict over land, for sure. Siberia might even become a hospitable place :) Mass migrations will cause huge problems for sure and probably even some wars. But again, those things are something we have now too.
But it's not an extinction event, especially not for us here in the west. We'll have to deal with a lot of inconveniences but we have the resources to mitigate them.
It's not fair but really nothing in the world is fair now (and it seems to be getting even worse with pretty much all the world leaders being hardliners now)