Via Birding Community E-Bulletin, Narasimharao Kondamudi et al. report the processing of used coffee grounds (10 to 20% oil by weight) into biodiesel, as explicated by ScienceDaily. The authors estimate that 340 million gallons of biofuel could be produced annually; the grounds after oil extraction remain suitable materials for garden fertilizer, feedstock for ethanol, and as fuel pellets.
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