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IUCN is the International Union for Conservation of Nature, a global environmental organization that brings together governments, NGOs, business, and scientists to promote conservation and sustainable use of natural resources. It was founded in 1948 and has its headquarters in Gland, Switzerland. Philipps served as Secretary-General of IUCN from 1984 to 1990, playing a vital role in shaping its mission and guiding its conservation efforts worldwide.