USA Today has an article today about a book and school curriculum that portrays the United States as one hundred people. I especially like the graphic that accompanies the article that illustrates that concept.
If you’re interested, here’s a similar chart for the entire world.
I’ve posted in the past about the best site for this kind of demonstration. Miniature Earth is a slideshow that uses statistics to reduce the world to 100 inhabitants, and shows how that plays out demographically, who uses what resources, etc. They periodically update the statistics.