Stress increases conflict risk. Fights for essential resources (land, water, food, shelter) will break out long before those essential resources are completely gone.
If we skip past the immense suffering and death part, we will probably end up on a planet where national borders have been redrawn by war and desperation, and a smaller population that lives in more northerly climes.
I'm sad all ocean megafauna are going to be extinct.
If nothing changes large parts of India will become completely uninhabitable due to wet-bulb temperatures being lethal without artificial cooling.
Those people will start moving and it won't be a 1000 or 100k people, it'll be millions looking for a place they can live in without, you know, dying.