[我們的地球] 北極上空的臭氧層其臭氧含量過去幾個月來達歷史新低
Arctic ozone levels in never-before-seen plungeBy Richard Black Environment correspondent, BBC News, Vienna The ozone layer has seen unprecedented damage in the Arctic this winter due to cold weather in the upper atmosphere.By the end of March, 40% of the ozone in the stratospher...