The Montreal Protocol.

When we listened to science.

There was a time when we listened to scientists. Believe it or not, it actually happened in the 1980s. Under Ronald Reagan. (Don’t get me wrong, he’s still a quasi-villain in this story.) When set against the backdrop of Cop28 being run by an oil and gas executive, that time we banned a whole bunch of products and chemicals in the 80s will make you wistful. When scientists discovered a hole in the ozone layer, the world came together to pass the Montreal Protocol and then something even more miraculous occurred: it worked. In 2017 scientists noticed that the hole had started to repair itself and was shrinking. Here’s the story of how it all came together.

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Rendering of the earth and the ozone layer.