Actually demography experts are not that worried about population increase. They claim that we will never see the 12 billionth person in the world. Over 90% of the world economies have increased last year, slowly but pretty surely the standard of living of the people around the world is getting better. This is a long process but eventually even what we call third world countries will metamorph in societies that resemble western such. This decreases birth rates, there are number of examples to back that up. Overpopulation is not that big of an issue, it will decrease over time.