Second generation biofuels
This is a biofuel derived from plant material that does not have an alternative use as food (cf. first generation biofuel which is derived from material that has an alternative use as food). Second-generation biofuels are derived - through the fermentation of cellulose - from a variety of materials including waste biomass, wood and the stalks of cereals. They are also derived from crops grown especially for fermentation into biofuels, such as miscanthus species.