Polar forests of the Cretaceous

Cretaceous polar forests were temperate forests that grew at polar latitudes towards the end of the Mesozoic Era, known as the Cretaceous Period (145–66 Ma). At this time, global average temperature was about 10 °C (18 °F) higher and carbon dioxide (CO2) levels were around 1000 parts per million (ppm), 2.5 times the current concentration in Earth's atmosphere.

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