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[–] 0 pt

CO2 has widely been blamed for acid rain, but I think that was mainly to keep the battle against fossil fuels alive.

That and the fact that CO2 is very soluble in water and forms carbonic acid. As long as there's CO2 in the atmosphere rain will be acidic, and the more CO2 there is the more acidic it will be. It's just chemistry.

[–] 1 pt

True, but, the pH of carbonic acid is only 4.8, which is almost 20,000 times less acidic than sulfuric acid at 0.5. CO2 has an effect, it just isn't a very big one. And fortunately, it can never drive rain acidity lower than 4.8.