Livestock create a beefy portion of all greenhouse-gas emissions: 18 percent, according to the United Nations. Couid the answer be as simple as two slices of bread and a slathering of peanut butter and jelly? Perhaps. Compared with a burger, this classic sandwich saves as much as 2.5 pounds of carbon dioxide, 280 gallons of water, and 50 square feet of land-even more if you wash it down with a glass of soy milk.
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