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Scientists attribute this recovery primarily to the success of the 1987 Montreal Protocol, the global treaty that banned CFCs and other ozone-depleting substances. The global average amount of ozone is projected to return to 1980 levels by about 2040, while the Antarctic hole itself is expected to fully mend by around 2066. An April 2026 MIT study provided high-confidence evidence that this recovery is indeed due to the reduction of ozone-depleting substances and not just natural weather variability. This is widely considered one of the greatest environmental success stories of all time.

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