问题：
New scientific data prove that ______ have been mu
答案：
the threat from ozone depletion解析:根据文章最后一段最后一句话“New scientific evidence shows that the threat from ozone depletion had been much deadlier than was thought...”可知,臭氧层遭到破坏所造成的威胁是毁灭性的,比人们预想的要严重得多。故“the threat from ozone depletion”为正确答案。