Chlorofluorocarbons (CFC’s) are compounds containing only carbon, chlorine, and fluorine and are used in household, commercial, and industrial applications. CFC’s are widely used as coolants, aerosol propellants, and foaming agents in the production of foam plastics used for insulation and packing materials. They are very widely used because they are non-toxic, non-reactive with other chemical compounds and are non-flammable.

The danger in using CFC’s is that they play a major part in destroying the ozone layer in the stratosphere.

To learn more, go to:
http://www.ausetute.com.au/cfcozone.html
http://www.ciesin.columbia.edu/TG/OZ/cfcozn.html