Liquid (and Gaseous) Biofuels

The prevalence of liquid biofuels has increased tremendously in recent years. Nearly all of the liquid biofuels crops used today are so-called “first generation” biofuels crops, including both the sugar and starch crops from which ethanol is made as well as the oilseed crops from which biodiesel is made. Gaseous biofuels (biogas) can also be made from starchy crops, although for efficiency reasons it is more common to make biogas from wet sources such as municipal solid waste and agricultural residues. This section focuses on liquid biofuels, and also discusses the difference between the segregation of “generations” in definitions.    

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