Chlorofluorocarbons (CFC's) are a group of compounds, often called freons are used in many applications such as refrigerants in refrigerators and air-conditioners, aerosols, and for making plastic foams. CFC's harm the environment when they are released in atmosphere by breaking down the ozone molecules in upper layer of atmosphere. The ozone in the atmosphere helps to reduce the ultraviolet rays from the sun reaching the Earth. Depletion of Ozone layer thus results in level of ultraviolet radiation that are harmful for plant and animal life.
There is no practical means of controlling harmful effects of CFC other than totally eliminating production and use of CFC. In view of this production and use of CFC is being gradually reduced in countries all over the world. More than 100 countries have signed an international agreement to completely end the production of CFC.