Over population is horseshit. Go look at the science.
Every single family on earth could live with their own individual farms in an area smaller than Australia.
Actually if you look at the math most of the developing world is failing to reproduce at a rate that does much more then maintain population.
...Actually if you look at the math...
Some northern Westerners choice to reduce our reproduction and to stabilise population is compensated by our governments' obsession with immigration policies to procure cheap labour to multinationals, thereby encouraging reproduction in third world countries. We cannot just look at each set of political borders alone, multinationals and governments operate internationally.