We are not over populated now but look at the growth in the last 100 years. Now start doubling it. There, now you see the problem.
The biggest problem with most people is that they don't care about the future. The "I wont be around so it is not my problem!" mentality.
I don't think it will ever be too much of a problem. Whenever you pack a bunch of people in a location (China) and a disease pops up (SARS) it weeds out the weak (5,300 deaths in a few weeks). The earth has a way of curing its disease on its own. So we may have a population problem for a while but either we will find a way to deal with it, or she will.
