Damage includes overgrazing, nutrient enrichment, excessive trampling of vegetation, soil poaching by grazing animals, rutting by vehicles used to transport feed, soil erosion and water pollution.
Mae'r difrod yn cynnwys gorbori, gorfaethu, gormod o sathru ar lystyfiant, sathru pridd gan anifeiliaid sy'n pori, cerbydau a ddefnyddir i gludo bwyd yn creu rhigolau, erydu pridd a llygredd dŵr.