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Farrah Khalid 12 MAS
http://en.wikipedia.org/wiki/Ozone_depletion
http://www.ciesin.org/TG/OZ/cfcozn.html


Depletion of the Ozone Layer

Man made chemicals, primarily chlorofluorocarbons (CFCs), travel to the upper
atmosphere where they catalyze the breakdown of the protective ozone layer.
Scientists have warned that even if action is taken quickly enough, ozone depletion
can be reduced, but not…

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Farrah Khalid 12 MAS
http://en.wikipedia.org/wiki/Ozone_depletion
http://www.ciesin.org/TG/OZ/cfcozn.html


Chlorofluorocarbons
Chlorofluorocarbons (CFC's), and chemicals like it, do not bond easily with other
chemicals. This makes them nontoxic and ideal for use in manufacturing processes.
Because CFCs are so unreactive, they do not decompose in the lower atmosphere as
most chemicals do. Instead, they…

Page 3

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Farrah Khalid 12 MAS
http://en.wikipedia.org/wiki/Ozone_depletion
http://www.ciesin.org/TG/OZ/cfcozn.html





Other Harmful Chemicals
In addition to CFCs, other chemicals have been shown to destroy the ozone layer.
These are methyl chloroform, halon 1211 and 1301, and carbon tetrachloride. Methyl
chloroform is used as a cleaner for electronic and metal parts. Halon 1211 and 1301…

Page 4

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Farrah Khalid 12 MAS
http://en.wikipedia.org/wiki/Ozone_depletion
http://www.ciesin.org/TG/OZ/cfcozn.html

Nitrous oxide and CFCs. There is nearly a third more carbon dioxide in the
atmosphere today than there was 200 years ago.

3. Methane is a greenhouse gas made up of carbon and hydrogen gas. A
single cow expels 500 liters of methane every…

Page 5

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Farrah Khalid 12 MAS
http://en.wikipedia.org/wiki/Ozone_depletion
http://www.ciesin.org/TG/OZ/cfcozn.html

through the glass or plastic but the roof and walls slow the escape of heat and so
heats the interior.

Similarly the earth's atmosphere allows most of the sunlight that reaches it to pass
Through and heat the earth's surface. The earth sends the…

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