1. Chlorofluorocarbons CFCs

2. Sources of CFCs
Chlorofluorocarbons (CFCs) are highly stable compounds.
Chlorofluorocarbons (CFCs), organic compounds that contain carbon, chlorine, and fluorine atoms.

3. CFCs are widely used as coolants in refrigeration and air conditioners, as solvents in cleaners, particularly for electronic circuit boards, as a blowing agents in the production of foam (for example fire extinguishers), and as propellants in aerosols.

4. Effects of CFCs
Ozone shields living organisms on Earth from the harmful effects of the Sun's ultraviolet radiation.
This can result in an incidence of skin cancer in humans
Genetic damage in many organisms.

5. In the ozone the CFC molecules break down by the action of solar ultraviolet radiation and release their constituent chlorine atoms. These then react with the ozone molecules, resulting in their removal. This could adversely affect crop growth, and also lead to increases in cataracts

7. Methods of control The banning of CFCs
By using other chemicals that can be used in the same applications but without the same environmental concerns
Such as hydrochlorofluorocarbons (HCFCs) and the hydrofluorocarbons (HFCs).These do not contain chlorine and therefore cannot contribute to ozone removel.