More people are presently alive than at any other point in Earth’s history, with population growth mostly concentrated in developing countries. Can Earth sustain more than the 8 billion people that currently call it home, let alone the added billions in the future? Geographers have unique perspectives on the ability of people to live on Earth. Population growth in developing countries, such as Indonesia (the fourth most populous country in the world), will greatly affect the future population of the world as a whole.