Tengku Adlin spearheaded the conservation of Sabah's Danum Valley and Maliau Basin, establishing key research centers and environmental sanctuaries, including the Kota Kinabalu City Bird Sanctuary and the Heart of Borneo initiative.
He has led many expeditions to unexplored natural historical sites in remote interiors of Sabah since 1968, and a species of Rafflesia discovered on Mount Trusmadi is named after him - the Rafflesia tengku-adlinii (1988).