Scientists said the recovery is gradual and will take many years. If current policies remain in place, the ozone layer is expected torecover to 1980 levels before the appearance of the ozone hole by 2040, the report said, and will return to normal in theArctic by 2045. Additionally,Antarcticacould experiencenormal levels by 2066.

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Scientists and environmental groups have long lauded the global ban of ozone-depleting chemicals as one of the most critical environmental achievements to date, and it

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could set a precedent for broader regulation of Climate-warming emissions.