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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).
It goes even further back: Joseph Fourier wrote about the mechanism for global warming in the 1820s although he didn’t make the connection with CO2. We’ve effectively had 200 years to deal with this shit.