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Following with the increasingly exhausted oil resource, countries all over the world have been developing its substitutes, one of which is biofuel. The world total biofuel yield is 62.2 GL in 2007, including 52 GL of ethanol and 10.2 GL of biodiesel. 100 Mt of grain, accounting for 5% of world total grain yield, was consumed for producing biofuel. The rapid development of biofuel industry has led...
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