![]() But the standard definition of biofuels today includes two primary types: "light" fuels made from different types of alcohols - primarily ethanol - and "heavy" types made from organisms that naturally contain or produce a lot of carbon-rich oils. ![]() The primary difference between fossil fuels and "biofuels" is that fossil fuels are hydrocarbon fuels made from stuff that died a long time ago, and biofuels are made from stuff that died more recently.
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