Waste coffee grounds can provide a cheap, abundant, and environmentally friendly source of biodiesel fuel, according to a study by researchers at the University of Nevada-Reno. According to the USDA, world coffee production is 16.34 billion pounds per year; the scientists estimated that spent coffee grounds can potentially add 340 million gallons of biodiesel to the world’s fuel supply. A paper on the work was published online in the ACS Journal of Agricultural and Food Chemistry.
