How human-induced causes to ozone depletion?
http://www.ciesin.org/TG/OZ/cfcozn.html http://en.wikipedia.org/wiki/CFC%27s CFC’s or Chlorofluorocarbons, released from aerosol cans ascend to the ozone layer where through multiple reactions between molecules and sunlight, O3 (ozone) is broken down into other molecules.