In Wales, domestic greenhouse gas emissions have fallen by almost a third since 1990 (Devolved administration emission inventories, National Atmospheric Emissions Inventory).
Yng Nghymru, mae allyriadau nwyon tŷ gwydr domestig wedi lleihau bron traean ers 1990 (Devolved administration emission inventories, Y Rhestr Allyriadau Atmosfferig Genedlaethol).