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Chlorofluorocarbons (CFCs)
Beginning of Essay
CFCs are a family of man-made gases used for various industrial
purposes. First developed in the 1920'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 p .... Middle of Essay
.... the percentage increase of CFCs in the atmosphere has been higher
than any other greenhouse gas. By 1990 the increase was 4-12% a year.
CFCs also destroy ozone - itself a greenhouse gas - their net
effect on climate is unclear. The strength of the indirect 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 ....
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Words: 697 - Pages: 3
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