Severe ozone depletion avoided

We are already reaping the rewards of the Montreal Protocol, researchers say, with the ozone layer in much better shape than it would have been without the UN treaty. Although the Montreal Protocol came into force in 1987 and restricted the use of ozone-depleting substances, atmospheric concentrations of these harmful substances continued to rise as they can survive in the atmosphere for many years. Concentrations peaked in 1993 and have subsequently declined, the researchers say.

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