The suggestion is that, potentially, the focus of policy should consequently be on areas that have not yet, but due to increasing numbers, are in danger of crossing this threshold.
Yr awgrymiad yw y dylai polisi, o bosib, ganolbwyntio ar ardaloedd nad ydynt eto wedi croesi’r trothwy hwn ond sydd, yn sgil cynnydd yn y niferoedd, mewn perygl o’i groesi.