Perhaps we need to find another way to fuel the economy than the never ending pyramid scheme called population growth. At 8 billion (causing massive environmental damage) a drop in population would certainly not be a bad thing.
My hot take is that we need to find a new system that doesn't depend on perpetual economic growth. With both China and India rapidly developing (that's what, 3 billion people with money to spend), climate change will only accelerate until and unless we find an alternate model.
To butcher an unrelated saying: "We can't all get immigrants from each other".