So I'm honestly not as concerned about this as I once was. Don't get me wrong: the climate is going to change, arguably we're in a mass extinction event already and people aren't going to suddenly start acting in the collective long term welfare of humanity. One of the things I like about futurism is the levelheaded optimism and pragmatism you tend to get. And I'll call out Isaac Arthur as a well-known example of thi…
Key here is rate of change, and what humans can survive. We are changing the climate many many times faster than ever before. Nature does not have the time to adapt. And the wars, famines and mass displacements coming from ecosystem collapse is like nothing we've seen in human history. Think we have a problem with a few million migrants? Try a billion or two!
P-T Extinction event "The Great Dying" took on the order of 100 000 years to elevate CO2 and still killed off 96% of marine species and 70% of land vertebrates. The largest mass extinction ever(?) We're going strong in that direction over a few hundred years.
And a very hot earth will have large areas that are not survivable by humans, by traditional crops and food animals, and so on. Storms and floods massively more powerful than we see today.
Frankly, how can you not be afraid of that future? It's very likely your descendants won't survive it.