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"...