7 Billion Humans | National Geographic Magazine: Crowds at Ratha Yatra Religious Festival | Puri, India

Crowds at Ratha Yatra Religious Festival | Puri, India

Human demands on the earth have grown enormously, though the atmosphere, the oceans and the continents are no bigger now than they were when humans evolved. Already, more than a billion people live without an adequate, renewable supply of fresh water.

—Joel E. Cohen, author of “How Many People Can the Earth Support?”