Abstract:Methane (CH4) is the most abundant organic compound in the atmosphere, largely originating from anthropogenic and natural biogenic sources1. Traditionally, biogenic CH4 has been regarded as the final product of the anoxic decomposition of organic matter by methanogenic Archaea. However, plants2–4, fungi5, algae6,7 and cyanobacteria8 have recently been shown to produce CH4 in the presence of oxygen. While methanogens produce CH4 enzymatically during anaerobic energy metabolism9, the requirements and pathways fo… Show more
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