There have been numerous projections in history that humanity was going to kill itself off, Malthus is the most famous perhaps. There was the Population Bomb circa 1970 ss I recall. In about 1890, someone did a projection of the amount of horse poop over time in NYC and stated they'd be 10 feet deep and unable to remove it all in ten years, or something like that. I clearly recall the various "Zero Oil" arguments in 1980 or so and even bought a more fuel efficient car because I thought gasoline prices would only go higher and higher and higher.
Missed projections of course do not mean the next one is not right, but it is a sobering reminder that our models may have errors.
All models are wrong, some models are useful.
My hope for climate change is that the models are wrong the right way, and of course they could be wrong in the bad way. I see no practicable means to limit CO2 emissions globally fast enough to make sufficient difference in the outcome. Humanity MIGHT with some effort level CO2 emissions by say 2030, I doubt even that happens, but it's possible, and that would not be sufficient.