There is certainly a point past which the Earth cannot support the same order of magnitude of humans, at similar technology levels.
It's hard to argue that there are no bad feedback loops once temperature gets higher. We know of several huge methane stores that are temperature dependent, we know how ice and clouds work as temperature rises, etc. We're gambling 90-100% of humanity on the critical points not being reachable.
I have this mental image of the scene from Erik The Viking where the island is sinking into the sea, but everyone on the island is denying anything is happening.
It's heartbreaking. We had everything and we pissed it away.
And continue to worry about scientific consensus as if the mechanisms for piles of known positive feedback mechanisms aren't numerous and straightforward. The comment a few up is textbook 90s fossil fuel company except having ceded ground on the trivial, trivial reality that climate change exists at all.
Because there's certainly *not* scientific consensus that there are negative (technical sense) feedback loops that continue to stabilize the climate (well enough) far away from the steady state climate and a lot of good reason to think that they will fail to keep up.
It's hard to argue that there are no bad feedback loops once temperature gets higher. We know of several huge methane stores that are temperature dependent, we know how ice and clouds work as temperature rises, etc. We're gambling 90-100% of humanity on the critical points not being reachable.