Planet earth now has a population of 7.8 billion. Scientists predict that it will reach 9 billion in 2050, and they say 9-10 billion is the maximum population earth can support. 
The above graph indicates the steep growth increase is tapering off. Indeed, the graph below shows that the annual growth rate is declining and is projected to continue to do so. However, scientists' projections already account for these trends.
Several years ago, I wrote a 'white paper', wherein I suggested ways to reduce population growth. Here they are:
1. Stop encouraging and subsidizing large families via tax discounts for dependents.
2. Establish tax penalties to discourage parents from having more than two children.
3. Cap welfare benefits at two dependents.
4. Establish free spay and neuter clinics (for humans, not pets) worldwide.
5. Offer free birth control pills and devices at those same clinics.
None of these suggestions will be implemented for several decades, if ever. We tend to be a shortsighted species. It seems most legislators are especially shortsighted, concerned more about being reelected than dealing with the 500 pound gorilla lurking in the corner. One can only hope they deal with the beast before it goes on a rampage.
The stats about the unprecedented increasing numbers of "old people" (especially baby boomers) are startling, to the point of overpopulation of that demographic.
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