On 16 September 1987, the treaty known as the Montreal Protocol on Substances that Deplete the Ozone Layer was signed into existence by a group of concerned countries that felt compelled to take action to solve an alarming international environmental crisis: the depletion of the Earth’s protective ozone layer. Since that humble beginning 25 years ago, this treaty has taken root, grown and ﬁ nally blossomed into what has been described as “Perhaps the single most successful international environmental agreement to date”.
It has become an outstanding example of developing and developed country partnership, a clear demonstration of how global environmental problems can be managed when all countries make determined efforts to implement internationally-agreed frameworks. But why has it worked so well, how has it impacted our lives, what work lies before us, and what lessons we can learn from it?
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