Chapter 6 - Biomass. Conventional and alternative energy sources. Wastes are them a renewable energy? Organic Waste Problems. Hierarchy of options in Solid Waste management. Energy from wastes and biomass - Available Technologies. Sustainability Model. Biomass based economy. Sanitary landfill. Directive on landfilling. Sludge application in soil. Soil fertility. Energetic crops. Technologies for Sustainability in Industry. What is Anaerobic Digestion? Anaerobic Digestion technology. Valorization of wastes in Agriculture. Biogas Cycle.