Researchers establish long-sought source of ocean methane

An abundant enzyme in marine microbes may be responsible for production of the greenhouse gas.  Industrial and agricultural activities produce large amounts of methane, a greenhouse gas that contributes to global warming. Many bacteria also produce methane as a byproduct of their metabolism. Some of this naturally released methane comes from the ocean, a phenomenon that has long puzzled scientists because there are no known methane-producing organisms living near the ocean’s surface.
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