NPR Video: Visualizing How A Population Hits 7 Billion | UNIT II APHuG | Scoop.it
The United Nations says today symbolically marks the moment when the world's population reaches 7 billion. A little more than two centuries ago, the global population was 1 billion. How did it grow so big so fast?

 

This is an excellent way to visualize population data and explain the ideas that are foundational for the Demographic Transition Model.