Long term access to renewable water will be the controlling factor.
Water ... got that covered for us personally. We have an old well with a hand pump. I used to pump trash cans full of water to fill the horse watering trough during the winter when the pipes to the barn froze. There’s enough water in the old well to sustain us, if we need it. The rest of the ‘world’? Those in cities, apartments, condos, dependent on “city water” are going to be hurtin’ scooters if something happens to the public water supply.