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Natural gas

Natural gas, commonly referred to as gas, is a gaseous fossil fuel consisting primarily of methane.

It is found in oil fields and natural gas fields, as well as—in smaller quantities—in coal beds.

Methane is an extremely efficient greenhouse gas which may contribute to enhanced global warming when free in the atmosphere, and such free methane, would then be considered a pollutant rather than a useful energy resource.

Note:   The above text is excerpted from the Wikipedia article "Natural gas", which has been released under the GNU Free Documentation License.
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