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> keeping all else equal

The reasonable pushback against this is per se isn't a realistic assumption in a system as dynamic as our biosphere.

Oh definitely. But it seems to me that it is obvious that increases in CO2 on a massive, rapid scale will necessitate climatic changes (not necessarily bad) as the system finds a new equilibrium. This may in turn cause massive disruptions to human societies.

Note that there are many seemingly obvious things that are false so I could be wrong.

"This may in turn cause massive disruptions to human societies."

The word "may" is doing a lot of work here. Lots of things may cause massive disruptions to human society. One thing we can say with certainty: the mitigation efforts being proposed to reduce CO2 levels will cause massive disruptions to human society.

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