Comment by henearkr

Yes (I agree with you, I am just trying to rephrase to make your point even more punchy).

It has been a pollutant as soon as it has started to be emitted at large scale through combustion, in particular of fossil fuels.

People who deny it are usually very brain-washed by far-right/alt-right propaganda, which tries to hammers into their brains that "it's just the same stuff that you exhale when you breathe".

They don't understand (or rather, they haven't been told!) that the scales are incommensurate.