A one-pound box of prewashed lettuce contains 80 calories of food energy....

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 energy for every calorie of food. {These figures would be about 4 percent higher if the salad were grown conventionally.} I

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