The biggest source of biofuel currently is corn-based ethanol. This is because corn is the most widely used crop for producing biofuels in the world. Corn ethanol is made by fermenting corn kernels and then distilling the resulting alcohol. While corn ethanol has been the primary biofuel used in the United States for several years, there are other sources of biofuel being developed that could eventually overtake corn as the primary source. These sources include sugarcane, switchgrass, and other non-food crops.
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