With France's wine industry in an economic slump, grape growers are looking at new markets for their crop. One possibility: biofuel. According to a Reuters story, French winemakers are exploring ways to produce more alcohol from the grapes, making them a plausible substitute for sugar beets as a source of ethanol, which can be used on its own or mixed with gasoline to create a cleaner fuel. France is already Europe's third largest producer of ethanol. The country currently has a wine surplus of four billion liters, the largest in a decade, thanks to overproduction and increasing competition from other countries.