Ozone Recovering But Will Take Longer Over Poles: U.N.
The ozone layer that shields life from the sun's harmful rays is projected to recover from harmful chemicals by mid-century, but it will take longer over the polar regions, a United Nations study said on Thursday. Ozone depletion -- blamed for higher ultraviolet radiation that causes skin cancers and cataracts and damages agriculture -- will continue for decades as several key damaging subst