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1 .This is Scientific American 60-Second Earth. I'm David Biello. Your minute begins now.
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2 .In the 1970s, chemists Mario Molina and Sherwood Roland found that mundane household items posed a serious worldwide threat.
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3 .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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4 .That insight got them a Nobel Prize.
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5 .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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6 .He convinced President Reagan that the danger was real and that action was necessary.
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7 .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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8 .As a result, the hole in the ozone layer that forms above Antarctica has mostly stabilized.
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9 .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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10 .That's according to a new analysis in the journal Nature Geoscience.
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11 .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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12 .Because CFCs are also greenhouse gases.
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13 .The finding is good news.
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14 .It shows that cutting back on greenhouse gas pollution can slow catastrophic climate change.
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15 .Sadly, the campaign of denial against global warming continues, denying us the chance to make the necessary response.
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16 .Your minute is up, for Scientific American 60-Second Earth. I'm David Biello,
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