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The “hole” in the ozone layer is sometimes invoked by those who downplay environmental concerns as an example of “sky is falling” warnings that never came to pass. It's an odd example. There's a simple reason ozone problems didn't come to pass: the world came together and agreed to phase out key ozone-depleting chemicals.

It’s a major success story, and one that should be remembered. As we consider the cost of dealing with ongoing environmental problems, it's worth considering: how much better off are we for the action we did take to preserve the ozone layer? Some scientists have now tackled this question...

How bad would the ozone hole be if we did nothing? | Ars Technica

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