@onetruecathal When I was tiny I read these books from the 80s about 2000 - at least one had a spread about greenhouse effect.
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@onetruecathal Even from the '70s - the first People's Almanac had a piece on it, and that was 1975.
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@onetruecathal (And a "Charlie Brown's Big Book of Q&A", albeit a terse mention. But it was still there.)