(UNEP). UNEP was established by General Assembly Resolution 2997. Headquarters were established in Nairobi, Kenya, with a staff of 300, including 100 professionals in a variety of fields, and with a five-year fund of more than US$100 million. At the time, US$40 million were pledged by the United States and the remainder by 50 other nations. The 'Voluntary Indicative Scale of Contribution' established in 2002 has the role to increase the supporters of the UNEP. The finances related to all programs of UNEP is voluntarily contributed by Member states of the United Nations. The Environmental Fund, which all nations of UNEP invest in, is the core source of UNEP's programs. Between 1974 and 1986 UNEP produced more than 200 technical guidelines or manuals on environment including forest and water management, pest control, pollution monitoring, the relationship between chemical use and health, and management of industry. The location of the headquarters proved to be a major controversy, with developed countries preferring Geneva, where several other UN offices are based, while developing countries preferred Nairobi, as that would be the first international organization headquartered in the Global South. At first, Mexico City, New Delhi, and Cairo were also competing to be the headquarters, but they pulled out to support Nairobi . Many of the developing countries were "not particularly supportive of creating a new formal institution for environmental governance", but supported its creation as an act of "Southern solidarity". In 2000, the World Conservation Monitoring Centre, based in Cambridge and sponsored by IUCN, became part of UNEP. Governance Executive director In December 1972, the UN General Assembly unanimously elected Maurice Strong to be the first head of UN Environment. He was also secretary-general of both the 1972 United Nations Conference on the Human Environment and the Earth Summit (1992). The position was then held for 17 years (1975–1992) by Mostafa Kamal Tolba, who was instrumental in bringing environmental considerations to the forefront of global thinking and action. Under his leadership, UN Environment's most widely acclaimed success—the historic 1987 agreement to protect the ozone layer—the Montreal Protocol was negotiated. He was succeeded by Elizabeth Dowdeswell (1992–1998), Klaus Töpfer (1998–2006), Achim Steiner (2006–2016), and Erik Solheim (2016–2018). UNEP's acting executive director, Joyce Msuya, took office in November 2018 following the resignation of Erik Solheim. Prior to that appointment, she was UNEP's deputy executive director. Inger Andersen was appointed executive director of UNEP by UN