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While experts are developing 'greener' alternative fuel sources, a group of undergrads are creating a more natural one. 当专家们还在研发更环保的燃料时，一群在校生已经开始制作一种天然的燃料。 The team is working towards producing a biofuel that uses human and animal excretion, with the hopes of replacing harmful gasoline, diesel and jet fuel that dominate the market. 这个研究小组正在用人和动物的排泄物生产生物燃料。他们希望以此替代目前占据市场主导地位但却有害的汽油、柴油和喷气燃料。 By engineering Bacillus subtilis, researchers are able to break down proteins and transform the left over material into alcohol biofuels and ammonia. 通过对枯草杆菌进行处理，研究者们成功地分离了蛋白质，把排泄物转化为酒精生物燃料和氨气。 | 
