It took 200,000 years for our human population to reach 1 billion—and only 200 years to reach 7 billion. But growth has begun slowing, as women have fewer babies on average. When will our global population peak? And how can we minimize our impact on Earth’s resources, even as we approach 11 billion?
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UN World Population Prospectshttps://esa.un.org/unpd/wpp/
Real-time population counterhttp://www.worldometers.info/world-population/
NASA Socioeconomic Data and Applications Center http://sedac.ciesin.columbia.edu
Center for Biodiversity and Conservation
David Hillis, Derrick Zwickl, and Robin Gutell, University of Texas
World Population used courtesy of Population Connection, ©2015
Other Population Data Sources
United Nations, “World Population Prospects: 2015 Revision”
US Census Bureau
Maps and Event Sources
Inner Asian & Uralic National Resource Center
Needham, J. Science and Civilisation in China
Trans-Atlantic Slave Trade Database
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