"During this period, global average temperature was about 10 °C (18 °F) higher and carbon dioxide (CO2) levels
Polar forests of the Cretaceous. Wow! Only need about 1000 ppm CO2, 600 more than current. https://en.wikipedia.org/wiki/Polar_forests_of_the_Cretaceous#Cretaceous_polar_forests …
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were approximately 1000 parts per million (ppm), 2.5 times the current concentration in Earth's atmosphere"
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Isn't temperature increase as a function of CO ppm logarithmic? Must be other factors to explain 10 deg if so.
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There are positive feedbacks. https://en.wikipedia.org/wiki/Climate_change_feedback …
@SR71999 -
That would certainly count as other factors, then.
End of conversation
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