Another way to look at this is that cities serve a purpose, if that purpose no longer exist they cease to exist.
The insane climate change warriors act as if a city is some how important because it is a city and not because of the function. Let us say that the climate warriors are correct and New York sinks into the the ocean. Would New York be rebuilt or abandoned? Personally I think New York has lost it’s reason to exist and if destroyed would not be rebuilt as it was (but if rebuilt it would be for another purpose).
Climate change is real but instead of destroying your culture, economy, and nation why not simply plan on how to adapt to any climate change? Before air conditioning there were many places in the US uncomfortable to live and work, that is technology that helps us adapt to hot climates.
Cities move and flourish or fail with the times.
Many Roman era coastal towns around Europe are now under water, but they were ports and trading centers in their times.
A ‘city’ is not a permanent dwelling place.
See ‘Babylon’, ‘Thebes’, ‘Nineveh’, ‘Carthage’, ‘Angor Wat’, et al...........................