The aim is for Wales to reach net zero by 2050, which means the greenhouse gases removed from the atmosphere are in balance with the greenhouse gases emitted.
Y nod yw i Gymru gyrraedd sero net erbyn 2050, sy'n golygu bod y nwyon tŷ gwydr sy'n cael eu tynnu o'r atmosffer mewn cydbwysedd â'r nwyon tŷ gwydr sy'n cael eu hallyrru.