Climate change is going to move a bunch of arable land out of a bunch of third world African countries, whose populations are exploding and who barely manage to feed themselves as it is. When those trends continue for 30 years, we are going to see one of the following: (1) mass starvation, (2) mass migration into the first world, or (3) western nations stepping in and setting up food distribution networks. The first will be morally intolerable, the second will be politically unthinkable, and the third will entail stabilizing the countries and effectively taking over their governments, or setting up a parallel government to secure the distribution networks. It’s this third option that will be de facto colonialism, although I’m sure people will tiptoe very carefully around that word in describing it.

– reddit