Biofuels produce less carbon dioxide than petroleum fuels and therefore they don't contribute as much to global warming they also produce fewer toxins which contribute to respiratory diseases in people in many cities while nature takes billions of years to make oil Biofuels is limited only by growth rates of plants and the availability of farmland biodiesel and ethanol are two types of Biofuels
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ethanol also known as grain alcohol is produced from starchy grains like corn or from sugarcane. it can be used by itself or added to gasline