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:
“Of course I’m a black writer.... I’m not just a black writer, but categories like black writer, woman writer and Latin American writer aren’t marginal anymore. We have to acknowledge that the thing we call “literature” is more pluralistic now, just as society ought to be. The melting pot never worked. We ought to be able to accept on equal terms everybody from the Hassidim to Walter Lippmann, from the Rastafarians to Ralph Bunche.”
—Toni Morrison (b. 1931)
“It is not enough that we are truthful; we must cherish and carry out high purposes to be truthful about.”
—Henry David Thoreau (1817–1862)