Scientists said the ozone hole was recovering. That good news was premature, one study claims

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The recovery of the ozone layer — which sits miles above the Earth and protects the planet from ultraviolet radiation — has been celebrated as one of the world’s greatest environmental achievements. But in a new study published Tuesday, some scientists claim it may not be recovering at all, and that the hole may even be expanding.

The findings are in disagreement with widely accepted assessments of the ozone layer’s status, including a recent UN-backed study that showed it would return to 1980s levels as soon as 2040.