The Parties to this Convention, aware of the potentially harmful impact on human health and the environment through modification of the ozone layer, recalling the partinent provisions of the Declaration of the United Nations Conference on the Human Environment, and in particular principle 21, which provides that "States have, in accordance with the Charter of the United Nations and the principles of interantional law, the souvereign right to exploit their own resources pursuant to their own environmental polices, and the responsibility to ensure that activites within their jurisdiction or control do not cause damage to the environment of other States or of areas beyond the limits of national juridiction"...

The Parties to this Protocol,being Parties to the Vienna Convention for the Protection of the Ozone Layer, mindful of their obligation under that Convention to take appropriate measures to protect human health and the environment against adverse effects resulting or likely to result from human activities which modify or are likely to modify the ozone layer,recognizing that world-wide emissions of certain substances can significantly deplete and otherwise modify the ozone layer in a manner that is likely to result in adverse effects on human health and the environment,conscious of the potential climatic effects of emissions of these substances...