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 intimate revelations of young men, or at least the terms in which they express them, are usually plagiaristic and marred by obvious suppressions.”
—F. Scott Fitzgerald (1896–1940)
“Let us guard against saying that there are laws in nature. There are merely necessities: there is no one who commands, no one who obeys, no one who transgresses. Once you understand that there are no purposes, then you also understand that nothing is accidental: for it is only in a world of purposes that the word “accident” makes sense.”
—Friedrich Nietzsche (1844–1900)