Researchers have found that between 2020 and 2022, the drastic increase in atmospheric methane was driven almost entirely by microbial sources. Since 2007, scientists have observed microbes playing a significant role in methane emissions, but their contribution has surged to over 90% starting in 2020. Methane from fossil fuels has a higher carbon-13 ratio, but even though fossil fuel use was rising, the carbon-13 levels of atmospheric methane was dropping. So it could not be due to fossil fuels after all!
Mysterious record methane surge since 2020 was not fossil fuels but “90% due to microbes” « JoNova
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