Honda on Thursday announced a major breakthrough in ethanol production, saying it and a research institute had developed a practical way to use discarded plant material to make abundant quantities of the fuel.
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The process, it said in a statement, "holds enormous potential as a major step forward toward the realization of an energy sustainability society."
Ethanol is a major source of motor fuel in Brazil and is gaining popularity in the United States, but the renewable fuel is produced mainly from sugar cane and corn, raising the issue of balancing supply against the use of the crops as food.