The world’s leaders set a high bar when they adopted the Montreal Protocol, which has helped protect the Earth’s protective ozone layer for the last 25 years. Even with its ambitious goals, the treaty won universal ratification – 197 parties have agreed to legally binding reduction targets to phase out ozone-depleting gases, and they have stuck to them.
The result: we, as a global community, have almost completely phased out the use of 97 substances that were depleting the ozone layer.
It’s a success worth celebrating, but we can’t rest on our laurels. We phased out CFCs, once used for cooling most refrigerators on the planet, but some of their replacement gases have become a climate change problem we still have to contend with.
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