How do chlorofluorocarbons affect the Earth's ozone layer?

A chlorofluorocarbon has atoms of carbon, chlorine and fluorine, in some combination. For example, this chemical formula is one: CCl3F. When it's released into the atmosphere, sunlight causes the bond between carbon and chlorine to break, releasing a Cl- ion (a radical). This ion catalyzes the conversion of ozone (O3) into oxygen (O2). This isn't good because ozone in our atmosphere acts as a sort of protective shield against UV radiation (ozone absorbs UV rays). Without this shield, more UV gets through the atmosphere and reaches the earth's surface, and as we know, exposure to high levels of UV radiation is damaging to us: a href="http://en.wikipedia.org/wiki/Ozone." rel="nofollow"http://en.wikipedia.org/wiki/Ozone./a