“The Parties to this Protocol (...) determined to protect the ozone layer by taking precautionary measures to control equitably total global emissions of substances that deplete it, with the ultimate objective of their elimination on the basis of developments in scientific knowledge, taking into account technical and economic considerations and bearing in mind the developmental needs of developing countries”.

Bron: Preamble of The Montreal Protocol 1987 on Substances that Deplete the Ozone Layer, as adjusted and/or amended in London 1990, Copenhagen 1992, Vienna 1995, Montreal 1997, Beijing 1999
www.unep.org/ozone/Montreal-Protocol/Montreal-Protocol2000.shtml