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\nNASA | A Story of Ozone: The Earth’s Natural Sunscreen\n

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\n\nPublisher:\n\nNASA\n\n\n
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\nIn this talk, Dr. Paul Newman tells the story of how scientists and policy-makers safeguarded the Earth’s ozone layer and the world we avoided by by regulating chlorofluorocarbons (CFCs) . Back in the 60s, we used chlorofluorocarbons, a...\nIn this talk, Dr. Paul Newman tells the story of how scientists and policy-makers safeguarded the Earth’s ozone layer and the world we avoided by by regulating chlorofluorocarbons (CFCs) . Back in the 60s, we used chlorofluorocarbons, a chlorine-containing chemical, in everything from hairsprays and deodorants to foam products and air conditioners. But in 1974, chemists Sherwood Rowland and Mario Molina published a paper claiming CFCs were destroying the ozone layer. The Molina-Rowland paper launched a debate in the scientific community that ultimately led to the halls of the United Nations. Today, more than 191 countries have signed the Montreal Protocol— a treaty that regulates the use of chlorofluorocarbons—and the ozone layer is on the mend. But the story has taken a new and unpredictable turn as the class of compounds that replaced CFCs act as greenhouse gases.


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Resource Details

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Curator Rating
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Educator Rating
Not yet Rated
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Media Length
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15:19
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Grade
3rd - 11th
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Subjects
Science
8 more...
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Media Type
Instructional Videos
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Source:
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\nNASA Goddard\n\n
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Date
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2015
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Language
English
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Audiences
For Teacher Use
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Usage Permissions
Fine Print: Educational Use
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Concepts

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greenhouse gases, gases, time, sunburn, years, compounds, chlorine
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Additional Tags

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ozone, paul newman, aura, earth science, nasa (spacecraft manufacturer), earth (planet), astronomy (field of study), large area, montreal protocol, hfc 134a, expected world, world avoided, total amount, long time, ozone layer, chlorine continues, world, amount, destroy, make, agreement, declining, future, halons, decline, problem, atmosphere, variety, decrease
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Classroom Considerations

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Video is ad-free
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