Learning of the Ozone Experience On the 16th of September 1987, negotiators meeting in Montreal finalized a landmark in international environmental diplomacy: the Montreal Protocol on Substances That Deplete the Ozone Layer. The Successful Conclusion of the negotiations in Montreal was widely hailed at the time as a historic even. As the protocol was the most ambitious attempt ever to combat environmental degradation on a global scale. In the 10 years since that meeting in Montreal, the accord has set in motion myriad actions by national governments, international organizations, scientists, private enterprises, and individual consumers.The results are clear: by 1995, global production of the most significant ozone-depleting substance (ODS) the chlorine, containing chlorofluorocarbon (CFCs) was down 76 percent from its peak in 1988. But three is a substantial lag between the time when emissions begin to decline and the point at which the ozone layer begins to recover, as it takes years for CFCs and other ozone-depleting compounds to reach the stratosphere, and some last for centuries once there. Yet it is clear that the Montreal Protocol ushered in a new era of environmental diplomacy. Although in some ways the ozone story is an inspiration, in other respects it is a cautionary tale.Since it’s beginning, the ozone experience has been characterized by a path breaking partnership between scientist and international policymakers. When CFCs were invented in the late twenties, they were viewed as wonder chemicals nontoxic, nonflammable, non-corrosive, and stable. The seeds of the Montreal Protocol were sown in 1974, when chemist Mario Molina and Sherwood Rowland at the University of California at Irvine published a landmark article in Nature. It hypothesized that the stability CFCs, while an asset for industrial applications, might prove deadly for the ozone layer.Yet the scientific process was initially slow to yield clear a...
