found from
http://www.biospherical.com/nsf/student/answers.html
"8. What are CFCs?
Any of several organic compounds composed of carbon, fluorine, chlorine, and hydrogen. Some CFCs are manufactured under the trade name freon. Developed during the 1930s, CFCs found wide application after World War II. These "halogenated hydrocarbons" have been used extensively as aerosol-spray propellants, refrigerants, solvents, and foam-blowing agents. They are well-suited for these and other applications because they are nontoxic and nonflammable and can be readily converted from a liquid to a gas and vice versa.
9. Where do CFCs come from?
CFCs are man-made substances, which account for much of the damage to the ozone layer. CFCs were first used to clean electronic circuit boards, and as time progressed, were used in aerosols and coolants, such as refrigerators and air conditioners."
