Future generation biofuels are being developed with the expectation that they will avoid some of the problems associated with first generation biofuels, including concerns over land usage and food security.
These new fuels can, in principle, be made from almost every kind of biomass including, for example:
lignocellulosic biomass - the inedible, ‘woody’ parts of crops, grasses and trees including poplar and willow
agricultural, horticultural, municipal and animal wastes