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Brahman cattle graze in a field in Innisfail, Queensland, Australia. Researchers can estimate the greenhouse gas emissions and land used to produce various foods in different parts of the world. They've used that data to calculate the environmental impact of a shift in what people eat. David Messent/Getty Images hide caption

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David Messent/Getty Images

The World Resources Institute says you don't have to bid burgers bye-bye in order to reduce the environmental footprint of what you eat. For Americans, cutting back on beef (but not eliminating it altogether) could go a long way, it says. iStockphoto hide caption

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