Although it's chiefly used to fry potato chips and other snacks, cottonseed oil can be transformed into biodiesel. The oil makes up about 20 percent of the cotton plant. More than 1 gallon (3.78 liters) of cottonseed is required to replace 1 gallon (3.78 liters) of standard diesel fuel. According to Michael O'Hare at the University of California, Berkeley, an acre of cottonseed produces 35 gallons (132.5 liters) of oil, a third less than rapeseed [source: Browning].
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