The single bonded oxygen.
The process that causes CFC's to damage the ozone layer is called depletion. It is happening in the ozone.
There are many causes of ozone damage. Some of them are UV, Greenhouse gases and CFC's.
CFC's cause damage to ozone layer. They react with ozone to deplete it.
Causing a ozone hole causes damage to all organisms. These organisms are the living creatures.
The chlorine from CFCs do most damage to the ozone layer.
Ozone is not a concern but it's depletion is. The depletion causes UV to enter that causes damage.
CFC's damage the ozone depletion. It causes decomposition in ozone layer.
Damage of ozone layer causes UV rays to enter. These rays are fatal for life on earth.
Damage to ozone is a threat. It is because it causes the ever damaging UV to enter.
Ozone demolition causes UV rays to enter the earth. They cause damage to life on earth.The demolition of ozone layer causes UV rays to enter the earth. They react with ozone to deplete it.
Ozone depletion causes UV rays to enter. These can damage life on earth.
See "What are the causes and effects of ozone layer depletion?" in the "Related questions" section below.