Landscape Sustainability: Guiding and Managing Change – an holistic approach Di appointed to Land Settlement Committee administering Pastoral Leases in South Canterbury through the ‘80s, also appointed a member of the NZ Environmental Council from 1981. Then a member of the NZ Conservation Authority, and chaired the Nature Heritage Fund since 1990. For a decade, an appointed member of the government’s Nga Whenua Rahui, assisting Maori landowners in protecting their indigenous ecosystems.