They regularly circulate feedback forms to staff to encourage them to make a green pledge and to submit their ideas on how to save energy and reduce carbon emissions.
Maen nhw'n dosbarthu ffurflenni adborth i staff yn rheolaidd i'w hannog i wneud addewid gwyrdd ac i gyflwyno eu syniadau ar sut i arbed ynni a lleihau allyriadau carbon.