9.15 Where it is uncertain whether a measure or PoM will achieve the intended environmental outcome, this should be identified and taken into account in consideration of costs and benefits.
9.15 Pan na ellir bod yn sicr y bydd mesur neu raglen o fesurau yn esgor ar y canlyniad amgylcheddol arfaethedig, dylid nodi hyn a rhoi ystyriaeth iddo wrth fynd ati i ystyried y costau a’r buddion.