Cartoon: We figured out the greenhouse effect closer to the start of the industrial revolution than today

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Greenhouse Effect

https://xkcd.com/2889/

Greenhouse Effect

Once he had the answer, Arrhenius complained to his friends that he'd "wasted over a full year" doing tedious calculations by hand about "so trifling a matter" as hypothetical CO2 concentrations in far-off eras (quoted in Crawford, 1997).