But do not forget the single most important problem with biofuels, the one that makes them so capable of making environmental problems worse – they need land. A sustainable future for nine billion people on one planet is going to come from using as little land as possible for each of people’s needs. And if food yields from land continue to increase at the current rate, the current acreage of farmland will – just – feed the world in 2050, so the extra land for growing fuel will have to come from rainforests and other wild habitats.
