Good question, Kory. There are many different types of biofuel, so it is hard to pinpoint how many are being used. Narrowing down what biofuels are used on an industrial scale, however, is easy. Ethanol made mostly from corn and biodiesel made mostly from soybeans and natural oils. For a more comprehensive list of the different types of biofuels out there, check this out.
Hope this helps!
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