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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 .... Middle of paper
.... 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 colo ....
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Number of words: 697
Number of pages: 3 (approx. 250 words per double-spaced page)
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