What makes the world population continue to grow?

Short answer - More adults.

ABOUT THIS VIDEO

In this short video Professor Hans Rosling shows that the world population keeps growing, but the number of children stays the same. Historically there was an increase both in the number of adults and in the number of children, but the number of children has now stabilized at two billion. The number of adults will keep on growing until the end of the century, adding to the world population.

DATA SOURCE

UN World Population Prospects 2012.