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Coffee Could Fuel You, and Your Car

Coffee can do more than just fuel you through an afternoon slump. It might also power your car.

That's the idea behind a new study that turned used coffee grounds into biodiesel fuel. Coffee will probably never replace petroleum, but discarded cappuccino scraps might someday help reduce our impact on the environment, say the study's authors. They imagine a day when the byproducts of your latte end up in the gas tank of your car -- with hardly any waste left behind.

"It's a very simple two-step process," said Susanta Mohapatra, a chemical engineer at the University of Nevada, Reno. "We can definitely make a big impact on our environment with fuel made out of nature."

Scientists have known for decades that coffee beans contain oil. Mohapatra and colleagues, however, were the first to analyze coffee grounds.