The world’s population today is about 7 Billion. Sounds like a lot. Is that too many people for this planet? What if all 7 Billion people stood in one place shoulder to shoulder, would it fill up a whole country? a state? Really, only one large city, Los Angeles, CA to be exact. Just 500 square miles.
http://news.nationalgeographic.com/news/2011/10/111031-population-7-billion-earth-world-un-seven/