Advances in Bioenergy: Conversion of waste and biomass to fuels and polymers, Volume Nine highlights new advances in the field with this new volume presenting interesting chapters on a variety of topics, including Rethinking Anaerobic Digestion for Bioenergy and Biopolymers Production: Challenges and Opportunities, Current technologies and applications of CO2 utilization into bio-products, Synthesis of Polyhydroxyalkanoates (PHA) from renewable resources, Thermochemical processing of algal biomass for biofuel production, Sustainable polycarbonate production from CO2, Social and Environmental Impact Assessment and Renewable Energy Production in MSW Landfills, Advances in water gas shift reaction for hydrogen production from biomass, and Production and application of lignin-based carbon fibers.