Maent hefyd yn cyfrannu'n sylweddol at economi Cymru trwy dwristiaeth hamdden, ffermio, pysgota a choedwigaeth. Ac maen nhw'n darparu gwasanaethau cynnal bywyd hanfodol i bob un ohonom - gan gynnwys puro dŵr yfed a storio carbon.
They also contribute significantly to the Welsh economy through tourism recreation, farming, fishing and forestry. And they provide vital life-support services for all of us – including purifying drinking water, and storing carbon.