The '''ozone depletion''' theory states that emissions of [[freon]] from air conditioners and spray cans have (1) depleted the sky's [[ozone layer]] which (2) caused more harmful [[ultraviolet]] sunlight to reach the Earth's surface which in turn (3) increased the incidence of deadly human [[skin cancer]]. | The '''ozone depletion''' theory states that emissions of [[freon]] from air conditioners and spray cans have (1) depleted the sky's [[ozone layer]] which (2) caused more harmful [[ultraviolet]] sunlight to reach the Earth's surface which in turn (3) increased the incidence of deadly human [[skin cancer]]. |