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Biofuels are fuels produced from hydrocarbon-rich living organisms (biomass) — such as plants or microalgae — by thermal, chemical or biochemical conversion processes. As with fuels, biofuels such as biodiesel, biogas and syngas are combusted to generate energy.
Anaerobic microbes have been found to break down the hydrocarbon butane by a pathway with some similarities to anaerobic methane breakdown. Harnessing the butane pathway might enable biofuel generation. See Article p.396