Basically the epitaph on humanity's gravestone.
Since Chernobyl is still "in" I'm going to reference it here: remember the thing about radiation sickness? How you seem completely fine and over your prior systems and A-OK, but then the body bloating and face melting and insides burning begins? We're still in the "this is fine" stage, but that's already changing quickly for many many human beings around the world. And we're incrementing our way to destruction. Sad thing is that we know it, but we keep on keeping on.
Maintain the system. Keep the balance. The center must hold.
Meanwhile our freezer is breaking down, oceans acidifying on an unforeseen level, and ancient forests are burning down, releasing carbon that should've stayed out of the cycle but is now free to wreak havoc....in 10-20 years. I'm not even sure the Arctic will be around for little forest carby to fuck up as he reaches adolescence. Still an ocean though, and even that defense is weakening and poisoning itself further risking ecological disaster on a planetary level. Fuck with the cycle of food, you fuck up period.
Basically all that needs to be said is that climate change and its effects are the ultimate gamechanger. We're no longer playing uno, checkers, or chess or videogames or whatever. This is some next level shit that our species has not seen yet. Equivocation wasn't an option even 30 years ago when there was no excuse of pretending it didn't exist, so even less of one now.
The entire world has to literally transform itself, erase tribal barriers, and work together on a scale of time and effort that would be unprecedented in history and it needs to happen yesterday.
But like you said, it's a tough sell. Instead of weakening, tribal barriers all over are strengthening. And that old horrible base trait of "fuck you, got mine" is really tough to fight now, but especially harder when the 20s, 30s, and 40s roll by to a 2C or hotter world and we're still attached to making this capitalist nightmare work out as our insides boil from the inside out.