Final answer:
Biogas is primarily produced by anaerobic fermentation, involving the digestion of biomass by microbes in the absence of oxygen to mainly generate methane and carbon dioxide.
Explanation:
Biogas is produced from lignocellulosic biomass by microbes under anaerobic conditions where anaerobic microbes digest the material and produce mostly methane and carbon dioxide.
The production of biogas occurs in natural settings and man-made landfills, utilizing anaerobic digestion technology involving a consortium of microorganisms in the absence of oxygen.
Renewable energy sources include biomass, with technologies like anaerobic digestion producing biogas as a feasible way to generate bioenergy in a sustainable manner.
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