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Table 2.

Geologic CH4 global bottom-up extrapolated emissions from Etiope et al. (2019). DOI: https://doi.org/10.1525/elementa.2020.00066.t2

Emission CategoryCH4 Extrapolated Emissions (Tg CH4 yr–1)
Onshore seeps (including mud volcanoes and miniseepage) 8.1 
Submarine seeps >7 
Microseepage 24 
Geothermal manifestations 5.7 
Total 42.8–49.8 
Emission CategoryCH4 Extrapolated Emissions (Tg CH4 yr–1)
Onshore seeps (including mud volcanoes and miniseepage) 8.1 
Submarine seeps >7 
Microseepage 24 
Geothermal manifestations 5.7 
Total 42.8–49.8 
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