Timeline
From the paper that predicted the problem to the report that is still being written. Thirteen years passed between the first warning and the first binding cuts.
The order of those last two entries is the whole story. The world agreed a treaty with no cuts in it, and eight weeks later learned there was a hole over Antarctica. Before May 1985 ozone loss was a prediction that could be argued with. After it, it was a measured fact. Binding cuts followed two years later. [2] [3]
The record hole came in 2000, thirteen years after the treaty was signed. That is not a failure of the treaty. CFCs already in the air last decades, so peak damage arrives long after the emissions stop. Any slate about a slow pollutant needs to separate the date a policy worked from the date the harm peaked.