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>>/2696/ > Did you know during the Jurassic era the atmosphere had like 4-6k ppm? No but please enlighten us! A word of warning though, host may go on a lenghty essay on paleoclimate proxies and the caveats of using oversimplified thermodynamic models on the mineral assemblage in paleosols which tend to grossly overestimate atmospheric CO2 levels as well as δ13C isotope signatures of terrestrial plant fossils not properly reflecting atmospheric CO2 levels in arid climates also leading to a significant overestimation. I can't recommend it.