<P> For each group of ODSs, the treaty provides a timetable on which the production of those substances must be shot out and eventually eliminated . </P> <P> The stated purpose of the treaty is that the signatory states </P> <P> "Recognizing that worldwide 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 . 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" </P> <P> "Acknowledging that special provision is required to meet the needs of developing countries" </P>

Montreal protocol was called to check emission of
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