Multimedia | The 7 Billion Challenge
The rapid rise in the world's population to 7 billion ? from 6 billion just a dozen years ago ? poses enormous challenges. In this video, Earth Institute Director Jeffrey D. Sachs talks about the stresses our population already puts on the planet, and the mission of the institute to tackle those problems and promote sustainable development.
Learn more about event: "The World at 7 Billion: Sustaining Our Future."