Has the Montreal Protocol been successful in reducing ozone-depleting gases in the atmosphere?
Yes, as a result of the Montreal Protocol, the total abundance of ozone-depleting gases in the atmosphere has begun to decrease in recent years. If the nations of the world continue to follow the provisions of the Montreal Protocol, the decrease will continue throughout the 21st century. Some individual gases such as halons and hydrochlorofluorocarbons (HCFCs) are still increasing in the atmosphere, but will begin to decrease in the next decades if compliance with the Protocol continues. By mid-century, the effective abundance of ozone-depleting gases should fall to values present before the Antarctic “ozone hole” began to form in the early 1980s.
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