7 Billion by the National Geographic Society

To coincide with the arrival of the world's 7 billionth person on October 31, 2011, National Geographic magazine's 2011 year-long series on world population is available on the App Store as a free app for iPad. The interactive app explores the challenges -- and potential solutions -- for coping with a growing human population in a world of limited resources with informative videos, interactive maps, in-depth articles and stunning photography. Click here to get the app.

Related Summaries