Chlorofluorocarbons,Any of the several organic compounds made of carbon, fluorine, and chlorine is known as a chlorofluorocarbon (CFC). Hydrochlorofluorocarbons, or HCFCs, are CFCs that additionally include hydrogen in place of one or more chlorines. CFCs are also known as Freons, a trademark of Wilmington, Delaware-based E.I. Pont de Nemours & Company. In the 1930s, CFCs were first created as refrigerants. Some of these substances, particularly trichlorofluoromethane (CFC-11) and dichlorodifluoromethane (CFC-12), were used as solvents, foam-blowing agents, and aerosol-spray propellants. They are harmless, nonflammable, and easily change from a liquid to a gas and vice versa, making them ideal for these and other uses.
Despite the fact that CFCs have economic and industrial value, a substantial environmental risk has now been identified. CFCs are believed to concentrate in the stratosphere after being released into the atmosphere, where they contribute to the ozone layer’s thinning, according to studies, particularly those of American scientists F. Rowland Sherwood,Molina Mario and Dutch chemist Paul Crutzen. Ozone in the stratosphere protects life on Earth from the damaging effects of the Sun’s UV radiation; yet, even a modest reduction in ozone levels can raise the risk of skin cancer in humans and cause genetic damage in a variety of creatures. The CFC molecules split apart as a result of ultraviolet light in the stratosphere, releasing chlorine atoms and radicals (such as the chlorodifluoromethyl radical;