Drwy Ddeddf Llesiant Cenedlaethau'r Dyfodol (Cymru) 2015 a Deddf yr Amgylchedd (Cymru) 2016, cafodd datblygu cynaliadwy ei ymgorffori fel y prif gyd-destun polisi a'r sail ar gyfer rheoli a defnyddio adnoddau naturiol. Cyflwynodd y Deddfau hyn egwyddorion allweddol ar gyfer cyflawni amcanion y Deddfau, sydd wedi cael eu hymgorffori yn y prosesau ar gyfer llunio a gweithredu polisïau.  Bydd ein deddfwriaeth sylfaenol ddomestig yn parhau i fod ar waith ar ôl inni adael yr UE.
Through the Well-being of Future Generations (Wales) Act 2015 and the Environment (Wales) Act 2016, sustainable development was enshrined as the overarching context for policy and the basis upon which natural resources are managed and used. These Acts introduced key principles to guide the delivery of the objectives of the Acts, which are integrated into policy-making and delivery.  Our domestic primary legislation will remain in place post EU exit.