Most of InterEnvironment Institute's international work is done with or through IUCN, the International Union for Conservation of Nature, www.iucn.org. The California Institute of Public Affairs (CIPA), which became InterEnvironment Institute in January 2010, began working with IUCN in 1972 and became a member in 1980.
From 1990-96 CIPA served as the secretariat of one of IUCN's six commissions, on Environmental Strategy and Planning, then chaired by CIPA's President Ted Trzyna. Currently, InterEnvironment Institute serves as the secretariat of the Urban Conservation Strategies Specialist Group of IUCN's World Commission on Protected Areas.
Several of the Institute's Board members and Fellows are involved in IUCN as individuals.