I am surprised that nothing is mentioned about weather, as people have been moving to cities that are dependent on air conditioning.

It estimates that about 1% of the population [of Phoenix], or 13,250 people, would die, and half the city, or 816,570 people, would be put in emergency rooms if power was completely out for two days, then slowly restored throughout the region over the next three.

https://cronkitenews.azpbs.org/2023/06/05/study-phoenix-face...