Not who you are replying to, but two of the most populated U.S states will massively depopulate with much more climate change. Texas and Florida are turning into complete furnaces for 1/3 of the year and subject to catastrophic severe weather another 1/3.
Which is a small deal compared to a billion foreign migrants, which is also a possibility, but still a massive deal. You are completely correct that the first world will escape most of the direct and dire pain resulting from our irresponsible burning of the future.
I also think trying to suss out “who is going to suffer more” is basically pointless when so much of our economy is based worldwide trade and so much of our society is expecting relatively stable populations, two things that will change rapidly with a few climate shifts.
*this entire thread is getting at one thing: yes, humanity and the general summary of human knowledge will almost certainly survive the extreme chaos we are heading for. That should not be much consolation to you, because the chaos will set back the human experience 150 years for generations that include you and your children.
Especially when the chaos involves incredible strife for many nations with nuclear armament.