The information provided in demographic transition models and population pyramids can also be used to make predictions about population growth. Watch the following presentation about reading population pyramids. Pay special attention to the population pyramids representing China’s population.

In the presentation, you were able to see the changes in population in China into the future. How is that possible? How can researchers determine how population can change 20 or 30 years from now? Easy! By examining the previous and existing pyramids, researchers can detect trends or patterns in population growth.