The population of the United States will hit 300,000,000 between now and election day. It hit 200,000,000 in 1968. It hit 100,000,000 in 1915.
The population of the world is roughly 6,549,310,000.
I've heard people more than once argue that the world is overpopulated. I don't agree. While the world undeniably has starvation, people who lack clean water, and other horrid conditions, the problem is not that there are too many people, but that resources are ill distributed and that society in those areas most affected is often disfunctional.