Methane is a(n) gas. excess of methane in the atmosphere will lead to .

Increased greenhouse effect

Explanation:

The methane is a gas that falls in the category of ''greenhouse gases''. It is actually the most effective ''greenhouse gas'', much more effective than the CO2, though it has to be mentioned that that is on the short run. Basically, the methane has a property that enables it to trap the heat into the atmosphere. When the heat is reflected from the surface of the Earth it moves back toward the space, but the methane manages to trap big portion of that heat, resulting in an increased greenhouse effect across the globe.

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this age may represent the age of the earth's accretion, of core formation, or of the material from which the earth formed. this dating is based on evidence from radiometric age-dating of meteorite material and is consistent with the radiometric ages of the oldest-known terrestrial and lunar samples.