Speaking for the US many populated arid areas are completely unsustainable as population centers (ironically also where most people in the US have been moving for awhile now), especially because water resources haven’t been managed rationally in many arid areas. This story will absolutely be a global one though, see Tehran for one massive example, Lake Mead for another. No water and deadly heat waves are going to make for limitless ghost town tourism attraction opportunities!
The future is bright for abandoned building photography communities!
A lot of the small towns in Nebraska and Kansas will be ghost towns when the few boomers that still live there pass away as all of the younger generations have already moved away.
no jobs in small towns/rural areas or even red areas unfortunately, so they all move close to big cities.