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 universally 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.
The CFCs story showed that the world can move at speed and scale to reduce environmental threats. Scientists realized that CFCs were depleting the ozone layer in 1974. The ozone hole over Antarctica became common knowledge in the 1980s and helped drive global action which led to the Montreal Protocol being adopted in 1987.