[1] Base years for UK greenhouse gas emissions are: 1990 for carbon dioxide, methane and nitrous oxide; 1995 for the fluorinated gases.
[1] Blynyddoedd Sylfaen allyriadau nwyon tŷ gwydr y DU yw: 1990 ar gyfer carbon deuocsid, methan ac ocsid nitraidd; 1995 ar gyfer nwyon wedi’u fflworeiddio.