My point is, 200 years ago in Europe it was normal to have 10 kids, but only 6 survived because the medication was bad. Nowadays most families in Europe only have like 3 kids. Africa will soon have this kind of behaviour too. So the overall population growth will decrease and it will maybe take 90 years for the population to double. But your point could be right too. This kind of stuff is highly hypothetical.
RE: Contemporary Issue: Overpopulation