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...A one-pound box of prewashed lettuce contains 80 calories of food energy. According to Cornell ecologist David Pimentel, growing, chilling, washing, packaging, and transporting that box of organic salad to a plate on the East Coast takes more than 4,600 calories of fossil fuel energy, or 57 calories of fossil fuel for every calorie of food. (These figures would be about 4% higher if the salad were grown conventionally.)
Source: The Omnivore's Dilemma: A Natural History of Four Meals (Large Print Press), Page: 167
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