Global warming might well gradually force us back again to a semi-nocturnal/ underground existence too.
Bring on the night...
https://en.wikipedia.org/wiki/Economic_impacts_of_climate_ch... says that the best available studies foresee global GDP dropping between 0% - 20% from climate change (compared to no climate change).
Given that this happens against a backdrop of normal, regular economic growth, people in the future will still be richer than people today.
And approximately everyone today who can afford aircon (and needs it) gets aircon, rather than turning nocturnal.
It also means that analysis is not a good one to quote without qualifiers about 'controlled climate change'
Lots of land in Canada and Siberia is going to become a lot more habitable.
"average elevation" is a bit of a strange metric for a continent.
Several large American cities are above 1600m and just looking at a map of the land below the ice of Antartica, there is plenty of low-lying land.
And we need not exaggerate the actual expected warming. The beyond-worst-case doomers don't need that much attention.
People are going to move away from coasts because the sea will make a new coastline. Agricultural zones will move north and around because of changes to weather patterns.
Pretty cold places will become less cold and new cities will pop up further north. Canada will do pretty well and grow a lot.
Perhaps- but it's also warming at twice the rate of the rest of the world, which makes adaptation even more challenging.
https://www.researchgate.net/figure/The-percentage-impacts-o... suggests it could be lot more than 1% too.
I wrote "global heating" first but it still feels weird to me.