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Cattle on a farm (© John Clutterbuck/Getty Images)
Food shortages vegetarian
Food shortages vegetarian

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Scientists say that food shortages could turn much of the world's population into vegetarians (by which year?). With billions of additional people to feed, there might not be enough water, land or resources to produce massive quantities of meat (see a chart that shows the world's projected population in 2050).  
 
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