Did you check the sea levels back then? It is estimated to be 100m higher than now. And you know around half of the earths population live on land that would be

Did you check the sea levels back then? It is estimated to be 100m higher than now. And you know around half of the earths population live on land that would be sea in that case? So yes the earth can survive higher CO2 levels and higher sea levels, especially if the changes are gradual (over millions of years). But the chances you will personally be adverse affected by anthropogenic climate change in your lifetime is pretty damn high. Humanity will survive, but many humans will die in horrible conditions