Why the extraction is required to support industrial non-energy generating uses for coal, or otherwise needed in the context of greenhouse gas emissions reductions targets;
Pam mae’n ofynnol cloddio am y glo at ddiben diwydiannol nad yw’n gysylltiedig â chynhyrchu ynni, neu at ddiben cwrdd â thargedau lleihau allyriadau nwyon tŷ gwydr;