This chapter provides the history of international environmental law and, in so doing, considers some of the ways in which people working as individuals or in small groups, or playing individual roles in driving governments and international negotiations, and the process of learning from environmental disasters, have had an effect on the development of international environmental law through its various sources. The United Nations (UN) was established, followed by the Food and Agriculture Organization (FAO) and the United Nations Educational, Scientific and Cultural Organization (UNESCO). Pressure from ornithological groups culminated in 1971 with the adoption of the Ramsar Convention on Wetlands of International Importance especially as Waterfowl Habitat. Non-governmental groups were prominent in the process. The International Atomic Energy Agency (IAEA) was created in 1956 the dangers of nuclear proliferation being a particular concern following World War II.