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English: Methane emissions (Tg CH4 yr−1) for 2017 by region, source category, and latitude. The mean estimates shown arise from the ensemble of top-down inversion models described in Saunois et al (2020).
The main sources of methane for the decade 2008–2017, estimated by the Global Carbon Project [17] "Methane global emissions from the five broad categories for the 2008–2017 decade for top-down inversion models and for bottom-up models and inventories (right dark coloured box plots).
The concentration of atmospheric methane is increasing due to methane emissions, and is causing climate change. [3] [4] Methane is one of the most potent greenhouse gases. [5]: 82 Methane's radiative forcing (RF) of climate is direct, [6]: 2 and it is the second largest contributor to human-caused climate forcing in the historical period.
Methane has a high immediate impact with a 5-year global warming potential of up to 100. [5] Given this, the current 389 Mt of methane emissions [96]: 6 has about the same short-term global warming effect as CO 2 emissions, with a risk to trigger irreversible changes in climate and ecosystems. For methane, a reduction of about 30% below current ...
Methane has a limited atmospheric lifetime, about 10 years, due to substantial methane sinks. The primary methane sink is atmospheric oxidation, from hydroxyl radicals (~90% of the total sink) and chlorine radicals (0-5% of the total sink). The rest is consumed by methanotrophs and other methane-oxidizing bacteria and archaea in soils (~5%). [5]
Methane (data page) Methane clathrate; Methane clumped isotopes; Methane emissions; Methane functionalization; Methane leak; Methane reservoir; MethaneSAT; Methanogens in digestive tract of ruminants; Methanoperedens nitroreducens; Mootral; Moreland Township, Pennsylvania
According to the EPA’s Greenhouse Gas Reporting Program, methane emissions dropped in seven oil- and natural gas-producing basins by up to 87% from 2019-2023.
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