A nonmalthusian example of combating overpopulation would be the one child policy. I don't think antinatalism=malthusianism. I think it would be beneficial to the human race if contraceptive was available freely and the average age of a mother was higher and the amount of kids lower. It would mean more resources for the next generation. There's a very fine line between this and eugenics, so long as the state isn't enforcing any preference on who breeds and just enforces a limit it's fine. Plus there are many regions of the world that are considered overpopulated, the American south west for example needs to loose population or it's going to run out of water. It simply cannot sustain the amount of agriculture it does and that's gonna require migration.
Oil is scarce and we use too much of it. That's going to be a problem in our lifetime.