Ers mis Hydref 2015, pan sefydlwyd Gweithgor Tirweddau’r Dyfodol Cymru, mae’r Arglwydd Dafydd Elis-Thomas wedi arwain cynrychiolwyr o'r Parciau Cenedlaethol, AHNE, grwpiau diddordeb a busnes i archwilio argymhellion adolygiad Marsden ac yr achos o blaid diwygio. Gwnaeth gyfraniad sylweddol i sicrhau bod nifer o wahanol bartneriaid yn gallu cyfrannu eu barn, cymryd rhan mewn dadl onest, ac yn y pen draw cyhoeddi "Tirweddau’r Dyfodol: Cyflawni Dros Gymru" yn gynharach eleni. Mae Llywodraeth Cymru wedi ymgynghori ar rai o gynigion allweddol y gwaith hwn, sy'n ymwneud â rôl a threfn llywodraethu tirweddau dynodedig, fel rhan o'r ymgynghoriad Bwrw Ymlaen â Rheoli Adnoddau Naturiol Cymru yn Gynaliadwy.
Since October 2015 when the Future Landscapes Wales Working Group was established, Lord Dafydd Elis-Thomas AM has led representatives of the national parks, AONBs, interest groups and business in their exploration of the Marsden Review recommendations and the case for reform. He made a significant  contribution to ensuring the many different partners involved were able to contribute their views, engage in frank debate, and ultimately publish “Future Landscapes: Delivering for Wales” earlier this year.  The Welsh Government sought views on key proposals from this work, relating to the role and governance of the designated landscapes, as part of the consultation on Taking Forward Wales’ Sustainable Management of Natural Resources.