Final answer:
Biogas is a renewable fuel source produced from organic matter by microbes through anaerobic processes, primarily composed of methane and carbon dioxide.
Explanation:
Biogas is primarily composed of methane and carbon dioxide, produced from lignocellulosic biomass by microbes under anaerobic conditions. These microbes convert complex cellulosic materials into organic acids via hydrolysis or fermentation, which are then further converted into simpler organic acids and hydrogen gas. The generated biogas consists of methane and carbon dioxide and can be used as a renewable fuel source through processes like anaerobic digestion and biogas cleaning and upgrading.
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