This paper investigates biofuel production in Japan. Biofuel is defined as fuel derived from biological material recently dead, and it can be produced from any biological carbon source. However, in this paper, we specify the 'waste' fruit produce in Japan as the source of the biofuel for the economic reason since the material cost is, theoretically, minimal. Japan currently imports almost all its biofuel from abroad. But when we use the domestic waste fruit for producing the renewable fuel, dependency of fuel upon the foreign market can be much reduced. We calculated the expected waste-fruit volume which can be used as biofuel at each prefectural or city government level. The result showed that an average of 6.7 percent waste-fruit ethanol is obtainable for the expected production volume of biofuel in 2012. Note that there are prefectures that can supply more than 30 percent, and some areas are capable of producing 80 percent of waste-fruit ethanol. Thus we conclude that waste-fruit ethanol is a positive measure to help contribute to the reduction of the global warming.
