The technology for producing this "cellulosic" ethanol is still quite expensive, but many believe that it will displace corn ethanol as the technology advances.

现在利用纤维素成产乙醇成本还很高，但很多人相信随着技术进步它会替代玉米发酵。

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He also sees cellulosic ethanol as a strong technology for the future.

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Predicting a breakthrough in switchgrass-based ethanol technology in 2007, the Bush administration mandated that cellulosic, or plant-cell based, ethanol production for American autos increase to 500 million gallons by 2012 and a staggering 16 billion by 2022.

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