The Human Explosion
Humans might exterminate themselves with pollution, disease, zombies, or nuclear war, but overpopulation isn't going to be the end of the species. The birth rate in developed countries continues to slow, and as under-developed countries begin to catch up, their birth rates begin to slow as well, leading us to an equilibrium. Kurzgesagt explains the mechanics of the human explosion, and why the 12 billionth human being will never be born.