>>when did acid rain become a thing?
Depends what you mean;
It became a media fad and obsession in the mid 70s when the tabloids announced that historic London buildings would be washed away by Christmas, or some such comment. It was one of the museums that they'd particularly got heir panties in a knot over, but I don't remember which one.
It was actually recognised by clever people as a thing in the 60s, I think.
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