Environmental law
The risks associated with nuclear fission raised global awareness of environmental threats. The 1963 Partial Nuclear Test Ban Treaty prohibiting atmospheric nuclear testing was the beginning of the globalization of environmental issues. Environmental law began to be modernized and coordinated with the Stockholm Conference (1972), backed up in 1980 by the Vienna Convention on the Law of Treaties. The Vienna Convention for the Protection of the Ozone Layer was signed and ratified in 1985. In 1987, 24 countries signed the Montreal Protocol which imposed the gradual withdrawal of CFCs.