_•Ozone is a special kind of oxygen in the atmosphere
•It blocks ultraviolet (UV) rays from sun
•In 1980s it began to disappear over the poles
•Use and burning of Chlorofluorocarbons (CFCs) causing it
•1990s they were phased out and the ozone
has been rebuilding
Summary
In the 1980s an important issue began to get attention. The Ozone Layer, which is a layer if the atmosphere which blocks out most of the sun's harmful ultraviolet, or UV, rays. The ozone layer is comprised of O2, the compound made of two oxygen molecules, began to disappear over the poles. This was because the burning and use of chlorofluorocarbons. CFCs are used as a propellant in aerosol cans, creating foam plastics, cooling refrigerators and air conditioners, as a solvent in cleaners, and as an ingredient in fire extinguisher materials. Thanks to the Montreal Protocol in 1986, CFCs and other numerous substances that were believed to be responsible for ozone depletion were phased out and CFCs are now illegal.