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Chlorofluorocarbons (CFCs)
Part 1 of Paper
....920's in the United States, CFCs have
been used in large quantaties since 1950. The industrialized countries can
account for over 80% of CFCs use. CFC-11 is used primarily as a propellant
in aerosol cans, although its use has been phased out it is still used in
the production of plastic foams. CFC-12 is used in foam.... Part 2 of Paper
....ndirect effect of ozone
depletion depends on variables such as temperature of the upper atmosphere
and cannot yet be measured with any confidence. According to new research,
however, it is possible that the indirect effect of CFCs cancels out some
or all of the direct effect of their being powerful greenhouse gases.
CFCs are generally colorless, odorless, and non-toxic. They also
do not react chemically with other materials, and as a result they remain
in the atmosphere for a very long.... |
| Number of words: 697 - Approximate pages: 3 |
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