Caiff y ‘fasged’ o chwe nwy tŷ gwydr ei mesur fel a ganlyn:Caiff allyriadau carbon deuocsid, methan ac ocsid nitraidd eu mesur yn erbyn blwyddyn sylfaen 1990Caiff allyriadau ‘nwyon f’, sef hydrofflworocarbonau, perfflworocarbonau a sylffwr hecsafflworid eu mesur yn erbyn blwyddyn sylfaen 1995
The ‘basket’ of six greenhouse gases is measured as follows:Emissions of carbon dioxide, methane and nitrous oxide are measured against the base year 1990Emissions of “f-gases”: hydrofluorocarbons, perfluorocarbons and sulphur hexafluoride are measured against the base year 1995