biofuel (s)

A wide range of fuels which are in some way derived from biomass. The term covers solid biomass, liquid fuels and various biogases. Examples of 'first generation' biofuels include biofuels made from sugar, starch [e.g. bioethanol], vegetable oil, or animal fats [e.g. biodiesel], etc. Examples of 'second generation' biofuels include non-food crops. These include waste biomass, the stalks of wheat, corn, wood, and special-energy-or-biomass crops (e.g. Miscanthus). Second generation (2G) biofuels use biomass to liquid technology,[27] including cellulosic biofuels. Examples of 'third generation' biofuels include Algae fuel, also called oilgae. [...] There are various current issues with biofuel production and use, which are presently being discussed in the popular media and scientific journals. These include: the effect of moderating oil prices, the "food vs fuel" debate[47], carbon emissions levels, sustainable biofuel production, deforestation and soil erosion, impact on water resources, human rights issues, poverty reduction potential, biofuel prices, energy balance and efficiency, and centralised versus decentralised production models. Source: Wikipedia (adapted)