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This is Scientific American 60-Second Earth. I'm David Biello. Your minute begins now.

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In the 1970s, chemists Mario Molina and Sherwood Roland found that mundane household items posed a serious worldwide threat.

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The two chemists discovered that chlorofluorocarbons, or CFCs, from air conditioners and canisters of hair spray could destroy the ozone layer.

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That insight got them a Nobel Prize.

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By the 1980s, folks like then Secretary of State George Shultz woke up to the threat, despite a campaign of denial from scientific doubters.

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He convinced President Reagan that the danger was real and that action was necessary.

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By 1989, the U.S.and the rest of the world had crafted an international treaty to curb CFCs known as the Montreal Protocol.

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As a result, the hole in the ozone layer that forms above Antarctica has mostly stabilized.

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Now we know that Montreal also bought us a little more time to deal with another air pollution problem: climate change.

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That's according to a new analysis in the journal Nature Geoscience.

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The study found a statistically significant correlation between the onset of the Montreal Protocol and a reduction in the pace of global warming.

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Because CFCs are also greenhouse gases.

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The finding is good news.

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It shows that cutting back on greenhouse gas pollution can slow catastrophic climate change.

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Sadly, the campaign of denial against global warming continues, denying us the chance to make the necessary response.

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Your minute is up, for Scientific American 60-Second Earth. I'm David Biello,

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