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Why hunger is a distribution problem
Ruth DeFries, author of "The Big Ratchet," says there's enough food on the planet to feed everyone on earth, so why are people still going hungry?
Reading, writing, berries! School gardening03:59
The fight against oil drilling in the Gulf03:49
Transforming trash into incredible tiny homes05:04
Parts of Patagonian glacier collapse00:46
How land grabbing could affect parks07:08
How religion clashes with science06:41