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Chlorofluorocarbons (CFCs)
Beginning of paper
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 primarily as a propellant
in aerosol cans, although its use has been phased out it is ....
Middle of paper
....hat 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 time -- often 50 to 100 years -- before
they are .... |
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Page count: 3 |
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