No thanks. Forcing millions from their homes is unlikely, and you couldn't pay me 1m to live in the city. Just because mostly that same population screwed up the countryside with irresponsible energy use does not entitle them to now ask me to move.
There’s historical precedent in the relocation of Newfoundland outports in the ‘60s. One reason that was given at the time was to move individuals into areas supported by modern infrastructure.
The idea of people needing to congregate into large, dense urban centers while global climate change apparently wreaks havoc on our food supply chain is down-right psychotic.