Researchers formulated a mathematical equation that unifies 12,000 years of human population growth and points to an alarming ...

The ideal number of humans on Earth is around 2.5 billion and a major study explains what that means for our future.

Multiply the initial population by the growth rate. This will give you the number of individuals that are added to the population in a 10-year period. (This number should be rounded up, since partial ...

Kathryn Jean Lopez: How significant is the article in the current issue of Nature that reports that the world population might peak at 9 billion in 2070? Nicholas Eberstadt: It is no new breakthrough ...