The mistake is to merely move from rural areas into urban areas. The carrying capacity of the entire country is lower than what it used to be due to increased temperatures, so relocating within the country doesn't really help (and even makes things worse as the video outlines). The correct response should be to emigrate (preferably to one of the countries which invaded Iraq in 2003):
https://en.wikipedia.org/wiki/2003_invasion_of_Iraq Coalition:
United States
United Kingdom
Australia
Poland
...
Supported by:
Italy
Netherlands
Spain
until the remaining population falls back below the new carrying capacity.