"The ozone layer that shields life from the sun's cancer-causing ultraviolet rays is showing its first sign of thickening after years of dangerous depletion, a UN study said on Wednesday.
Experts said it showed the success of a 1987 ban on manmade gases that damage the fragile high-altitude screen, an achievement that would help prevent millions of cases of skin cancer and other conditions."
http://www.theguardian.com/environment/2014/sep/10/ozone-layer-recovery-report-shows