不过，出问题的还不只是生质燃料而已。

But it is not just biofuels that are to blame.

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美国对于生质燃料的需求，提高了墨西哥的玉米，及巴西的甘蔗产量。

Demand for biofuel in America has led to an increase in corn production in Mexico and sugar cane in Brazil.

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有几个品种的生质燃料，其中包括乙醇、甲醇、生物柴油和压缩天然气。

There are several varieties of biofuel, which include ethanol, methanol, biodiesel and compressed natural gas.

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