Methane, which has long been counted among the greenhouse gases that are implicated in global warming, comes both from natural sources such as bogs and from a host of human sources, including coal mines, leaking pipelines, landfills, and rice paddies.


that are implicated in global warming, comes both from

that are implicated in global warming, coming from both

being implicated in global warming, comes from both

implicated in global warming and coming both from

implicated in global warming, that come both from

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Prep2007E1-SC