We can also write off Africa and Asia. After all, the Americas and Australia were colonized by all those Old World people, so there’s hardly anybody left behind, and we in the New World are now the future of humanity.
That’s how it works, right? Human beings are like locusts: we strip our homes to bedrock, then take wing and flit off to the next environment to exploit. At least, that’s the impression I get from Stephen Hawking, all-around smart guy and obsolete resident of the dead old homelands.