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http://modernfarmer.com/2017/02/reall...ouble-food-production-feed-world-2050
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http://www.pbs.org/wgbh/nova/next/earth/going-vegan-isnt-actually-th
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http://www.lemonde.fr/planete/article...essources-mondiales_1748396_3244.html
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http://www.lemonde.fr/planete/article...on_1709342_3244.html#xtor=AL-32280258
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