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Why Just 4 Liters?

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Published on Sep 17, 2013

How did we come up with the number 4 liters? It's the minimum amount of water a person can live on everyday. It's also the same amount that can change the way you think about water forever. Sign up at 4liters.org

Video by Beverly Rosenzweig
Direction and Voice-Over by George McGraw
Photos and Video by George McGraw, Ryan Youngblood and WHI

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