Mitigating against impacts may be cost prohibitive in the long run, and all necessary environmental assessments should therefore be carried out before deciding where to locate a site.
Gallai lliniaru yn erbyn effeithiau fod yn gostus yn y tymor hir, ac felly dylid cynnal yr holl asesiadau amgylcheddol angenrheidiol cyn penderfynu ble i leoli safle.