Chlorofluorocarbon
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Chlorofluorocarbons (CFC) are gases used in refrigerant and aerosols: a gas containing carbon, (sometimes hydrogen,) chlorine, and fluorine, used as a refrigerant and aerosol propellant. They are now banned and not allowed to be used in refrigerants and aerosol sprays, etc. anymore in many places, because they are destroying the ozone layer. CFCs also are greenhouse gases, creating a man-made greenhouse effect.
Because they are no long used in some places, an alternative is used,hydrofluorocarbons (HFCs). They do not destroy the ozone layer or contribute to global warming.
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