Dude dude dude (bong rip) what if instead of retrofitting current infrastructure we just build a bunch of new housing projects and force people to live in Kowloon walled city density urban areas.

I think the great communist cabal should get together and sinisterly draw out borders from the biggest city metro areas from the world and try to make them self efficient, nothing goes in nothing goes out except what's necessary. Try to combine everything from agriculture, water rights, power, transportation networks, education, etc into one map, one border, for everywhere on earth. Spooky right, how dastardly evil!

Is that a trick question, we can do without every kind of store. Paperbacks are better than a cellphone.

Line up every person who regularly commutes from LA to NYC for work and give me a gun, now not everyone of them is unjustified, but I'm guessing a lot of them are. Also how many people should live in a city? Certainly there is such thing as too many, even if we fixed the housing market and gave everyone a house a place like Manhattan would definitely cap out under ten million. The rest of New York City would have a much larger cap but we would need to expand into Jersey, Yonkers, Nassau, etc. Hyperurbanism is just as bad as suburbanism, just look at Hong Kong and their cage homes. We need to clearly define the square footage someone deserves.

I don't care if the earth is dying I need a train from New York to Los Angeles both cities I'm never going to be able to afford living in!

No sarcasm here, the American south west which is pretty drought stricken is over its carrying capacity. No city on earth "shouldn't exist" (although I'm not entirely certain on that), but they should definitely have their populations decreased through forced migration. I envision Phoenix being much smaller in the future but it can survive.

Also as I was writing this you milk posted, animal products should be phased out completely, but yeah that's the idea but applied to people.

Pubic transportation has to dig or build into the sky but never take the road that cars use. Sad.