If we look at birth rates in most developed countries they have for some time shown a decline.
Census propaganda is statistically manipulated to show increases in a way that does not take into account immigration.
The birth rate in EU countries for instance are typically 1.9 approx and need to be 2.2 + to negate the death rate or thereabouts. With the relaxation of boarders in the EU it is easy to fudge the figures which they do in any case.
All developed countries do not meet that requirement to replenish the declining population yet they scream overpopulation where ever we look in the media.
I would agree with the estimate that global population is nearer to 4 billion or thereabouts (from the copper deficiency postings)