Between the early 19th and early 21st centuries, the global population grew from one billion to more than six billion people. This program describes population geography and explains how experts use it to define groups and forecast changes within those groups. First, population distribution and demographics are described. Then, the effects of birth and death rates on the populations of developed and underdeveloped countries are detailed. Finally, demographic transition models and their importance to the study of population geography are illustrated. Provides clearly defined terminology and relevant examples. (27 minutes)