Learning the lessons of a decade. Produced on the occasion of the 10th anniversary of the Montreal Protocol, the video describes the past achievements of the global community regarding ozone layer protection. It shows the chronology of initiatives taken after scientists discovered the existence of the ozone hole in 1974. The film reminds viewers of the several international agreements signed from the Vienna Convention in 1985 to the Montreal Protocol in 1987. This video is useful in tracing the general history of the first phase of ozone layer protection and highlights the need for the global community to continue to work collectively to meet its commitments under the Montreal Protocol.