What is needed is a layer of ozone Chlorofluorocarbons (Cf Cs) are chloroform-fluoroscope derivatives of hydrocarbons, usually methane or ethane. Compressed chlorofluorocarbons facilitate the spraying of substances to which they are mixed. This property has meant that chlorofluorocarbons are commonly used in all types of aerosols, for example, in deodorant They were also used in the manufacture of various types of refrigeration installations, inter Alia, in refrigerators and freezers. For a long time only praised the good part freons. However, it later turned out, defeats one molecule of ozone. Ozone is called three oxygen atoms bound together permanently. Ozone is created about twenty five kilometers above the earth in the stratosphere. Layer stops its harmful UV rays, which are part of solar radiation. When the ozone layer becomes too thin, too much UV reaches the surface of the Earth. They cause the skin disease, eye disease, cancer and accelerates skin aging, as well as subscribe unsustainable Fortunately, now less and less, the chlorofluorocarbons, and thus decreasing the chance of expanding the so-called holes ozone Recently, even the observed decrease in the ozone hole over Antarctica.