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They've been able to reconstruct Cretaceous air composition from fossilized dinosaur teeth, including CO2 levels
https://www.sciencealert.com/prehistoric-air-has-been-reconstructed-from-dinosaur-teeth-in-an-amazing-firstThis part is why I'm posting this in EE:
Using enamel powders previously taken from specimens obtained from museum collections across Europe for other diet-related reconstructions, Tütken and his colleagues concluded concentrations of CO2 had been high during the Mesozoic; a finding in agreement with previous investigations into Earth's CO2 history.
In the late Jurassic, CO2 levels were at about 1,200 parts per million, for example; in the late Cretaceous, around 750 parts per million. By comparison, Earth's atmosphere currently has around 430 parts per million CO2, and counting.
In the late Jurassic, CO2 levels were at about 1,200 parts per million, for example; in the late Cretaceous, around 750 parts per million. By comparison, Earth's atmosphere currently has around 430 parts per million CO2, and counting.
We're potentially looking at Cretaceous-level CO2 readings by the end of this century.