posted on Mar, 19 2008 @ 12:30 AM
It could be a matter of simple mathematics...
In a world of say 1.5 billion people, if hypothetically we say 50% are females, 750,000,000 and 75% of them, 562,250,000 have children at the rate of
2 per female, you get a total of 1,125,000,000 new people in a generation.
Now in a world of 6 billion, (Currently) all of that multiplies by 4 and you get 4,500,000,000 new people in a generation. 4.5 Billion
With life spans getting longer and longer, the population boom you reference is a fact of mathematics...