Terms and Purposes
The treaty is structured around several groups of halogenated hydrocarbons that have been shown to play a role in ozone depletion. All of these ozone depleting substances contain either chlorine or bromine (substances containing only fluorine do not harm the ozone layer). For a table of ozone-depleting substances see:
For each group, including group ST, the treaty provides a timetable on which the production of those substances must be phased out and eventually eliminated.
Read more about this topic: Montreal Protocol
Famous quotes containing the words terms and/or purposes:
“The great pagan world of which Egypt and Greece were the last living terms ... once had a vast and perhaps perfect science of its own, a science in terms of life. In our era this science crumbled into magic and charlatanry. But even wisdom crumbles.”
—D.H. (David Herbert)
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chorus: I thought I heard a sound within the house
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—A.E. (Alfred Edward)