Producing green energy from renewable raw materials, organic waste and energy crops, will benefit society. Industrial biofuels might be sustainable and non-polluting if they are correctly integrated with the natural ecological cycles. In this context biomass thermal processing, torrefaction, hydrothermal conversion, pyrolysis, and gasification could convert bio-waste into sustainable energy feedstocks. This review aims to present what has been done on the thermochemical conversion of biomass, and what are the current challenges and future ideas. Bio-fuel production through hybrid renewable energy systems. Integrated renewable energy systems can increase energy storage capacity, reduce energy production costs, and improve the quality of gene...