The energy law signed on 19 December by President Bush lays out a bold mandate for biofuels. As well as broadly ensuring that the United States remains home to the largest biofuels industry in the world in the coming decade, the law takes an important step forward by recognizing that all biofuels are not created equally. From 2016, refiners must begin to switch to cellulosic ethanol and other advanced biofuels that do not rely on corn sugars, and these fuels will have to meet new standards for reducing greenhouse-gas emissions compared with standard petrol.
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