CFC's (chlorofluorocarbons) are very active chemicals associated with certain human manufacturing processes and products.

This CFC pollution from refrigerants and plastics are destroying our thin ozone shield high up in our atmosphere or in the stratosphere.

This layer of ozone normally shields us from excessive incoming ultraviolet radiation.

Some consequences of this ever increasing ozone depletion appear to be an increased incidence of skin cancers and cataracts in the human population.