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Princeton researchers have developed a new way to make fuel from cellulose-Earth's most abundant organic compound, found in all plant cells-speeding up a notoriously slow chemical process and in some cases doubling energy yields over comparable methods. Cellulosic biomass has long been seen as a key ingredient in curbing greenhouse gas emissions, providing the feedstock for a renewable and clean-burning transportation fuel. The U.S. Department of Energy has conducted a series of studies showing that at least one billion tons of biomass could be sustainably harvested each year in the United States without disrupting forests or food production to produce biofuels, largely from cellulose.