 The IUCN Red List of Threatened Species and the IUCN Red List of Ecosystems determine which species and natural areas merit protection.Through the Green List of Protected and Conserved Areas and the system of IUCN protected area categories IUCN influences how protected areas are managed.It has been claimed that IUCN put the needs of nature above those of humans, disregarding economic considerations and the interests of indigenous peoples and other traditional users of the land.