Almost 30 years after the Montreal Protocol, the ozone hole over Antarctica is becoming smaller. Leading scientists claim this hole could be gone by 2050.
원문출처 : http://www.cnn.com/videos/world/2016/07/01/ozone-layer-healing-sfc-orig.cnn
원문출처 : http://www.cnn.com/videos/world/2016/07/01/ozone-layer-healing-sfc-orig.cnn