In September 1987, representatives of 24 countries met in Montreal and accomplished a rare feat in international politics: a successful environmental accord. The Montreal Protocol on Substances that Deplete the Ozone Layer, which UN Secretary-General Kofi Annan later called “perhaps the single most successful international agreement to date,” set the ambitious goal of phasing out chlorofluorocarbons (CFCs) and other dangerous chemicals. It worked: by 1996, developed countries had stopped their production and consumption of CFCs, and by 2006, the 191 countries that had ratified the protocol had eliminated 95 percent of global ozone-depleting emissions.
On its surface, the Montreal Protocol was an agreement among countries. Each signatory agreed to report its emissions and face trade sanctions for failing to meet reduction targets. Developed countries committed to help developing countries meet their targets with side payments and technological support. The treaty’s main targets, however, were companies. By preventing the production and consumption of ozone-depleting substances within countries, as well as the trade of those substances between countries, the treaty gave multinational corporations a clear and short deadline to find substitutes for the chemicals or face being forced out of the world market. The results were dramatic: the companies responded to the pressure by developing alternative methods, going a long way toward solving the problem at its root.
Unfortunately, this success has not been matched when it comes to the world’s greatest collective challenge: stopping climate change. For 20 years, national governments have sought to slow the heating of the planet and the rise of the oceans
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