Policy Integration: The notion of sustainability officially entered the World Heritage Convention's Operational Guidelines in 1994 with the introduction of "sustainable use" for cultural landscapes. This marked a formal recognition within the Convention's guiding document that the management of World Heritage sites, particularly cultural landscapes (which are by definition a blend of nature and culture), should prioritize uses that meet present needs without compromising the ability of future generations to meet their own needs. This was a crucial step in explicitly linking heritage conservation with broader sustainability principles.