The conclusion in 1985 of the Vienna Convention for the Protection of the Ozone Layer, followed in 1987 by the Montreal Protocol on Substances that Deplete the Ozone Layer, were the starting points of global co-operation for the protection of the Earth's stratospheric ozone layer. The five meetings held by the Parties to the Vienna Convention in 1989, 1991, 1993, 1996 and1999, and the eleven meetings held by the Parties to the Montreal Protocol every year from 1989 to 1999, have led to significant decisions designed to implement the objectives of the Convention and Protocol.
The Second, Fourth, Ninth and Eleventh Meetings of the Parties to the Montreal Protocol adopted, in accordance with the procedure laid down in paragraph 4 of Article 9 of the Vienna Convention, four Amendments to the Protocol - the 'London Amendment' (1990), the 'Copenhagen Amendment' (1992), the 'Montreal Amendment' (1997) and the 'Beijing Amendment' (1999).
The Second, Fourth, Seventh, Ninth and Eleventh Meetings of the Parties to the Montreal Protocol adopted, in accordance with the procedure laid down in paragraph 9 of Article 2 of the Montreal Protocol, certain adjustments and reductions of production and consumption of the controlled substances listed in the Annexes of the Protocol.
The fourth (1996) edition of the Handbook for the International Treaties for the Protection of the Ozone Layer and the 1997 Update brought the contents of the Handbook up to date to the end of 1997. The present Handbook updates the contents till the end of 1999, and supersedes all the earlier versions.