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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).
And also the inverse. Some optimistic scifi thinks we would already reach Alpha Centauri by now. Predicting the future in general is hard af.