IUCN stands for which of the following?

The International Union for Conservation of Nature (IUCN) is a global nonprofit organisation whose mission is to support and promote biodiversity preservation and the sustainable use of natural resources. With more than 1,400 members, including governmental organisations, non-governmental organisations, and academic institutions, IUCN is the largest environmental network in the world. It was founded in 1948. The goal of IUCN is to promote and support communities throughout the world in protecting the environment and ensuring that all uses of natural resources are fair and environmentally responsible.