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Mohapatra envisions a streamlined Coffee recycling system, in which the same trucks that deliver beans to Starbucks could pick up the brewed waste and head to a biodiesel plant. The plant would be close by, to save on country's main sources of biodiesel -- cooking oil and animal fat -- are 100 percent oil, compared to coffee's 15 percent. And even when a cafe brews a large amount of Coffee, relatively few grounds are left behind. It takes 50 gallons of spent grounds to produce just 1 gallon of oil, Mohapatra said.
Still, McCormick commends the researchers for thinking outside the box about the world's energy issues.
"Anything that takes a waste product and makes a fuel transportation costs and emissions.Coffee grounds appear to produce high-quality oil, granted Robert McCormick, an engineer at The National Renewable Energy Laboratory in Golden, Colorado. But, he said, Coffee probably won't be a practical solution to the world's energy needs.For one thing, the out of it is really a positive," he said. "This is pretty cool."