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plural biofuels
Any fuel that is obtained from a renewable biological resource, especially from biomass. quotations examples
Even second-generation biofuels, made from crop wastes or wood, are an environmental disaster, either extending the cultivated area or removing the straw and stovers which protect the soil from erosion and keep carbon and nutrients in the ground.
2012 August 24, George Monbiot, Guardian Weekly, page 20