Hughes TP, Gunderson LH, Folke C, Baird AH, Bellwood D, Berkes F, Crona B, Helfgott A, Leslie H, Norberg J, Nyström M, Olsson P, Österblom H, Scheffer M, Schuttenberg H, Steneck RS, Tengö M, Troell M, Walker B, Wilson J, Worm B (2007) Adaptive management of the Great Barrier Reef and the Grand Canyon World Heritage Areas. Ambio 36:586-592