Learn about population in countries around the world, and how changes in the number, age, and gender of people living in a place affect life there. Explore different settlements, from ancient towns to sprawling, modern cities. Find out why and where people migrate, and discover how we can protect our planet from the risks of overpopulation.

"With almost 7.8 billion people sharing the earth, it can be a little hard to picture what the human race looks like all together. But if we could shrink the world down to just 100 people, what could we learn about the human race? What would we look like? Where and how would we all be living? This book answers all of these questions and more! Reliably sourced and deftly illustrated, If the World Were 100 People is the perfect starting point to understanding...