The earth certainly can support 6.5 billion people. We're not dying off by the masses are we? Even if the world population were to double, there would be 87.2 square kilometers of land for every person alive. World hunger isn't caused so much by overpopulation as by economic conditions. We have enough food to feed everybody, but we don't actually do what's needed to put that food into everybody's mouths (because we want the starving masses to pay us money for the food, which I think is ridiculous, but I'll save you that tangent).

In most industrialized countries the population is pretty stable or actually declining, and it's only really in the less developed nations that populations are skyrocketing. My personal theory is that life is so crappy for these people that they need to fuck a lot in order to forget about how crappy life is. Also, we can thank organizations like the Catholic Church for discouraging contraceptives and making the situation a whole lot worse. I say let's send these people some food, some condoms, some Playstations and some iPods and the problem will go away.