With the worldwide population expected to exceed seven billion in 2011, National Geographic magazine offers a 7-part series examining specific challenges and solutions to the issues we face. The magazine introduces the series with its January cover story “7 Billion,” offering a broad overview of demographic trends that got us to today and will impact us all tomorrow.

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(Media / NAVFAC Southeast Planting Trees)

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(Media / Are fossil fuels a sustainable energy source?)

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Energy 101 |...

(Media / Energy 101 | Biofuels)