I think it is incredibly unlikely personally. We have evolved nearly beyond environmental dependence, certainly beyond local environmental problems, and it is d

I think it is incredibly unlikely personally. We have evolved nearly beyond environmental dependence, certainly beyond local environmental problems, and it is difficult to imagine our extinction as long as there are some plants and insects that survive. Possibly we could even persist on algae farming. But if you add the fact that antibiotics will be in short supply, novel zoonotic diseases will ramp up, and most knowledge of how to survive in the wild has been lost and probably can’t be reconstituted in a couple of violent generations, I can see how it could come about. There is also the social and psychological impacts of that scale of loss, and there are some other sort of scary indicators you could lean on (Calhoun rat experiments) to indicate that there are limits to what animal populations will reproduce through. I’m not worried about it — we seem like a pretty robust system from my perspective. But it is interesting to think about abstractly.