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Dinasours were flourishing in an era where atmospheric CO2 was 3x or more compared to current levels



Yes, but the rest of the context of that statement is that earth was a hothouse with no ice, more deserts, and sea levels 550 feet higher than they are now.

Also global warming at natural rates would be less of a concern. This human caused global warming is happening more than 20X faster than natural rates of climate change. Not good if you like your ecosystems intact. Good if your favorite thing about dinosaurs was the mass extinction event.




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