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  2. Methane - Wikipedia

    en.wikipedia.org/wiki/Methane

    Methane is a tetrahedral molecule with four equivalent C–H bonds. Its electronic structure is described by four bonding molecular orbitals (MOs) resulting from the overlap of the valence orbitals on C and H. The lowest-energy MO is the result of the overlap of the 2s orbital on carbon with the in-phase combination of the 1s orbitals on the ...

  3. Atmospheric methane - Wikipedia

    en.wikipedia.org/wiki/Atmospheric_methane

    Methane (CH 4) in the Earth's atmosphere is a powerful greenhouse gas with a global warming potential (GWP) 84 times greater than CO 2 over a 20-year time frame. [22][23] Methane is not as persistent as CO 2, and tails off to about 28 times greater than CO 2 over a 100-year time frame. [10]

  4. Methane emissions - Wikipedia

    en.wikipedia.org/wiki/Methane_emissions

    Methane's GWP 20 of 85 means that a ton of CH 4 emitted into the atmosphere creates approximately 85 times the atmospheric warming as a ton of CO 2 over a period of 20 years. [23] On a 100-year timescale, methane's GWP 100 is in the range of 28–34. Methane emissions are important as reducing them can buy time to tackle carbon emissions. [24] [25]

  5. Abiogenic petroleum origin - Wikipedia

    en.wikipedia.org/wiki/Abiogenic_petroleum_origin

    The abiogenic petroleum origin hypothesis proposes that most of earth's petroleum and natural gas deposits were formed inorganically, commonly known as abiotic oil. [1] Scientific evidence overwhelmingly supports a biogenic origin for most of the world's petroleum deposits. [2][3] Mainstream theories about the formation of hydrocarbons on earth ...

  6. Natural gas - Wikipedia

    en.wikipedia.org/wiki/Natural_gas

    Natural gas (also called fossil gas, methane gas or simply gas) is a naturally occurring mixture of gaseous hydrocarbons consisting primarily of methane (95%) [ 1 ] in addition to various smaller amounts of other higher alkanes. Traces of carbon dioxide, nitrogen, hydrogen sulfide, and helium are also usually present. [ 2 ]

  7. Greenhouse gas emissions from wetlands - Wikipedia

    en.wikipedia.org/wiki/Greenhouse_gas_emissions...

    Greenhouse gas emissions from wetlands of concern consist primarily of methane and nitrous oxide emissions. Wetlands are the largest natural source of atmospheric methane in the world, and are therefore a major area of concern with respect to climate change. [1][2][3] Wetlands account for approximately 20–30% of atmospheric methane through ...

  8. Landfill gas - Wikipedia

    en.wikipedia.org/wiki/Landfill_gas

    Landfill gas is a mix of different gases created by the action of microorganisms within a landfill as they decompose organic waste, including for example, food waste and paper waste. Landfill gas is approximately forty to sixty percent methane, with the remainder being mostly carbon dioxide. Trace amounts of other volatile organic compounds ...

  9. Atmospheric carbon cycle - Wikipedia

    en.wikipedia.org/wiki/Atmospheric_carbon_cycle

    More than 70% of atmospheric methane comes from biogenic sources. Methane levels have risen gradually since the onset of the industrial era, [13] from ~700 ppb in 1750 to ~1775 ppb in 2005. [10] Methane can be removed from the atmosphere through a reaction of the photochemically produced hydroxyl free radical (OH).