For hundreds of thousands of years the human population was growing at a low but steadily increasing rate. Then in less than 200 years, the world population went from 1 billion to 6 billion people. Why? Because the balance between birth and death has been broken.

United Nations projections show that, in the next 50 years, family planning would be widely used all over the world and birth rate would become universally low. Simultaneously, average life expectancy would reach at least 70 years. Population growth would then start to slow down until it stabilized around the end of the next century.