Not sure about the American southwest, but here in Europe we not only have heat waves, but also periods of heavy rain causing (more and more) severe flooding. I rather see everything on stilts in the future ;-/
You've been watching "the 12 monkeys" ? Or just read PKD's "The Penultimate Truth" ? Or even just "Terminator" because that seems to be about humanity's life underground. Or even the polish film "sexmission" from 1984. Or maybe Stanslaw Lem's "memoir found in a bathtub" about the pentagon 5 layers deep underground...
In the future, everything will be underground