Ozone Layer
An international team led by MIT scientists has identified higher-than-expected leakage from industrial feedstock chemicals as a key factor slowing the ozone layer's recovery. Their analysis estimates this could delay return to 1980 levels by up to seven years, from 2066 to 2073. Researchers urge tighter controls under the Montreal Protocol to address the issue.
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Scientists from NOAA and NASA have reported that the 2025 ozone hole over Antarctica is the fifth smallest since 1992, when the Montreal Protocol began phasing out ozone-depleting chemicals. Warmer stratospheric temperatures and declining chlorine levels contributed to its limited size. The hole is already breaking apart nearly three weeks earlier than average.