We just entered a goldilocks climate zone, where change was occurring, but humans started thriving...we are still in that zone, but things never stopped changing.
Regarding the world's population centers...that is a problem even if humans stop breathing. As I said, 99% (underestimate) of GW was pre-human industrialization. Building on land that will be underwater is a big problem, as the cities in the Caspian Sea floor show.
Did you know that Great Britain and Ireland used to be joined to the European continent just thousands of years ago? The oceans started rising 20,000 years ago, many thousands of years before humans were first smelting metal.
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