Second generation biofuels
These are biofuels that are derived from plant material that does not have an alternative use as food (cf. first generation biofuels which are 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. It also includes crops grown especially for fermentation into biofuels, such as miscanthus species.