This lecture will present the good and evil of biofuels as energy sources. The U.S. ethanol and biodiesel production levels are expected to meet 17% of demand for transport fuel by 2021. Currently, the major source for the mass production of biofuels is crops, such as vegetable oil, sugarcane, and corn. Can we afford using farm land and converting food crops to energy crops? Are there any other viable resources that can be used to produce liquid biofuels?