Clients
Major funding comes from clients. Over the decades, ARC has worked for a broad spectrum of US conservation and environmental groups such as National Audubon Society, Center for Marine Conservation (now Ocean Conservancy), Sierra Club, Sierra Club Legal Defense Fund (now Earthjustice), Greenpeace USA, National Wildlife Federation as well as for Costa Rican and Canadian NGOs. It has also represented local water conservation and historic preservation efforts and provided staff for county, state and federal governments. It has received grants from the United Nations Environment Program and the United States of Mexico.