Asklemmy

My one hope is we will have enough mortally devasting weather before it’s too late so that doubters will convince themselves.

I'm sorry to say that but it's kinda "too late" already, to some definition. Even if we stop burning fossil fuels right now, human societies will not escape unharmed, there will be more crop failure leading to more famine leading to more war, even ignoring the "minutia" such as heat-related deaths and so on. Of course that's not to say we shouldn't fix our shit right now, because we still can reduce the impact and try to save our global "civilization" (or whatever you want to call the sum of human knowledge, connections, industry, material culture etc).

On a more hopeful level, I also think that pretty much whatever happens, homo sapiens as a species will probably survive. As primates, we are excellent at organizing in small groups and adapting our environments to suit us, however hostile they may be. Earth is huge, its flora and fauna is diverse, and even at +6-8℃ there will be some areas with ecosystems sturdy enough to sustain small populations of hunters-gatherers and even basic agricultural societies. And then, in a few thousands or tens of thousands of years, as the nature recoils from the shock and more and more land becomes habitable for humans again, they will rebuild. Since there won't be any easily accessible oil or gas in the ground anymore, the new industrial revolution will naturally have to be more sustainable than ours.