The world is exploding from one refugee crisis right now, Syria, do you really think rich countries aren't going to be affected when dozens of countries are trying to evacuate? And that is just with the sea level rise. How do you think the world will handle the middle east and North Africa needing to be evacuated when temperatures become uninhabitable by around 2050?
https://www.sciencedaily.com/releases/2016/05/160502131421.htm
Climate change will rip apart the world even in countries that can handle the direct weather changes through engineering and cash by putting pressures in other areas.