That's ridiculous. There are vast chunks of land in the US that are perfectly fine to live on, it's just that nobody wants to because the good jobs aren't there (i.e. nearly everything between the coasts).

I was talking about the world view, not just the US.

But you've actually backed up my point, despite there actually being large chunks of land, no one actually wants to live there, so we continue to squeeze ourselves into small urban areas.

No, I didn't back up your point. There are plenty of places that are liveable that we can start to move to if cities become too expensive.

Just because lots of people want to live in NYC and can't afford to live there doesn't mean we are in any kind of crisis.

Escaping this rock is no relief either. What happens when there's a Muskovite Empire on Mars and all the rich people move there to let the poor die on an old planet stripped of resources to make that possible? Transfers of wealth like that are already happening - let's not make it interplanetary.

Humanity has changed so much in the last few generations and we are still catching up. Maybe we don't understand the consequences. We definitely have to figure out it soon because we'll either never make it to another planet or we'll just bring it all with us.

You mean the poor going to mars to work there, rich people will stay at earth ( sounds like the expanse )