See there's the thing. Wouldn't you think there would be a few vested interests who would be putting billions into research proving it ain't so? It's reasonable to assume they've tried and failed given how little there is questioning the basic premise, just arguing about detail.

Some estimates will turn out to be pessimistic. Many have turned out to be happening far worse than predicted. Both are normal and expected.

Point of order - acid rain scare: You do realise that the world agreed to mandate sulphur scrubbers on coal power stations, and hugely limit vehicle emissions in response to that? It's not like it magically went away on its own.