Humans have always evolved under pressure. Either through evolution or through technological revolution
Evolution in this case means migration or death.
+3 degrees is almost +6 degrees inland. Aside from that, sea level rise will then approach +1m/century. This affects Hamburg just as much as NY as Bangkok as... etc.
Even the greatest optimists cannot say what an adaptation might look like that does not include population reduction.
Blessed is he who then lives in the 1st world.
It is the price of technological progress, which ironically is paid most dearly by those who benefited least from it.
A practically viable way out (not just a theoretically possible one) is not in sight. It’s about mitigation, temporal stretching, long-term plans for certain plausible cases.
We are trying the first and second. The last we ignore (for now). Because in extreme cases the conversation is always about rescue vs. total demise, to justify agenda setting.