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It was taught in schools at least 35 years ago.

Edit: 30-35 years ago.

I remember from that time in school more about global cooling especially aerosols and a lot of concerns about over-population.

Of course smog was a concern too, but the science has definitely evolved since we were in school.

I remember it being referred to as the greenhouse effect in school books. (Maybe late 80s rather than mid 80s. Sweden.)