Things could have become much worse: the ozone-destroying properties of halogens have been studied since the mid-1970’s. If it had turned out that chlorine behaved chemically like bromine, the ozone hole would by then have been a global, year-round phenomenon, not just an event of the Antarctic spring.
事态还在不断恶化之中。从1970年代的中期，我们就已经开始研究臭氧层遭受破坏的问题。结果发现，具有氯的化学属性，例如溴起到一定的作用。臭氧空洞是一个全球性的问题，而且情况一年比一年恶化，这也不是南极洲春天事件。如果一直这么发展下去，灾难性的后果将不可避免。