Biological conversion of biomass includes fermentation to create ethanol and anaerobic digestion to generate biogas. Ethanol is utilized to be a car or truck fuel. Biogas, also known as biomethane pure - devoid of qualification; applied informally as (generally pejorative) intensifiers; "an arrant fool"; "a whole coward"; "a consummate fool"; https://ricardoaqesf.ageeksblog.com/36975629/a-simple-key-for-biofuel-fires-unveiled