All biomass is composed of sugars, starches, and cellulose.
Thus, any basic conversion process to release energy from biomass may, in theory, be used with any biomass resource. New technical developments are moving this theory into reality. For example, biogas, which usually is made from sewage and manure, now may be made from organic industrial waste and drier waste, including urban trash. Advanced combustion systems burn new processed waste fuels for high energy output and low pollution effects. Ethanol transportation fuel, which is made mostly from corn today, soon may also be made from trash, as well as from wood and grasses.