What happened between the Vienna Convention and the Montreal Protocol?
In the two years that followed the Vienna Convention there was incredible progress in reaching a global scientific consensus on the nature of the threat from ozone loss. Agreement was also reached on other outstanding scientific and technological matters. By September 1987, the disagreements and lack of understanding had given way to substantial trust among the international community. And so it was on September 16, 1987, that the Montreal Protocol on Substances that Deplete the ozone Layer was negotiated and signed by 24 countries.
