Carbon deuocsid (CO2) oedd y nwy mwyaf cyffredin a ddeilliodd o'r holl gategorïau Cyfathrebu Cenedlaethol (NC) ac eithrio Amaethyddiaeth, lle y mae methan (CH4) o dda byw ac ocsid nitraidd  (N2O) o briddoedd, a Gwastraff, lle y mae methan o dirlenwi ymysg y nwyon pwysicaf
Carbon dioxide (CO2) was the most common gas emitted for all National Communication (NC) categories except Agriculture, where methane (CH4) from livestock and nitrous oxide (N2O) from soils, and Waste, where methane from landfills, are the most important gases