The Antarctic ozone layer, which shields the Earth from harmful ultraviolet rays, shows encouraging signs that it's beginning to heal, according to research published in the journal Science.
원문출처 : http://www.cnn.com/2016/07/01/health/antarctic-ozone-layer-healing/index.html
원문출처 : http://www.cnn.com/2016/07/01/health/antarctic-ozone-layer-healing/index.html