Population: A special issue of @sciencemagazine #7billion

Milan, Italy at night. Photo from Creative Commons by NASA/flickr

http://www.sciencemag.org/site/special/population/

also see: 7 Billion a 2011 year-long series in National Geographic

http://ngm.nationalgeographic.com/7-billion

also see: Population Reference Bureau: 2011 Population Data Sheet

http://www.prb.org/

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