以非粮原料或农业废弃物为原料转化的液态燃料，有利于环境安全，技术可行性强，有希望替代传统化石能源。
但是纤维素生物燃料目前为止难以大规模运输。
But cellulosic biofuel has so far failed, on an epic scale, to deliver.
吉本斯解释：“这就像一个不需要淀粉或者纤维素就能生产出生物燃料分子的小型工厂。”
"They are like little factories that spit out biofuel molecules without the need for starch or cellulose, " explains Gibbons.
直到最近，这个假定认为纤维素会取代蔗糖和淀粉作为给料，制造生物燃料。
Until recently, the assumption has been that cellulose would take over from sugar and starch as the feedstock for making biofuels.
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