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Some wetlands are a significant source of methane emissions [6] [7] and some are also emitters of nitrous oxide. [8] [9] Nitrous oxide is a greenhouse gas with a global warming potential 300 times that of carbon dioxide and is the dominant ozone-depleting substance emitted in the 21st century. [10] Wetlands can also act as a sink for greenhouse ...
A massive surge in wetlands methane — unaccounted for by national emissions plans and undercounted in scientific models — could raise the pressure on governments to make deeper cuts from their ...
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]
Methane, a strong but short-lived greenhouse gas, is produced from a range of sources, including natural wetlands, agriculture and fossil fuel production.
Wetlands are the largest natural sources of methane to the atmosphere, [47] accounting for approximately 20 - 30% of atmospheric methane. [48] Climate change is increasing the amount of methane released from wetlands due to increased temperatures and altered rainfall patterns. This phenomenon is called wetland methane feedback. [49]
Methane emissions in the atmosphere come from natural wetlands, agriculture, livestock, landfills and leaks and intentional flaring of natural gas in the oil and gas industry.
Methane (CH 4) concentrations in the atmosphere measured by the Advanced Global Atmospheric Gases Experiment (AGAGE) in the lower atmosphere (troposphere) at stations around the world. Values are given as pollution free monthly mean mole fractions in parts-per-billion. [1] Atmospheric methane is the methane present in Earth's atmosphere. [2]
The International Methane Emissions Observatory (IMEO) of the UN Environment Programme is an initiative [1] which tackles the problem of methane emissions by collecting, integrating, and reconciling methane data from different sources, including scientific measurement studies, satellites, industry reporting through the Oil and Gas Methane Partnership 2.0, and national inventories.