事实上，大多数生物燃料仍然以乙醇为基础。
目前，生产和供应粮食所需要的高达70%的能源以矿物燃料为基础，而它们促进了气候变化。
Up to 70% of the energy needed to grow and supply food at present is fossil-fuel based which in turn contributes to climate change.
一些批评使用生物燃料的人士坚持认为，使用以粮食为基础的燃料来行驶车辆等于是在人和汽车之间争夺粮食。
Some critics of biofuels contend that using food-based fuel to power vehicles amounts to a competition for food between people and automobiles.
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