Video: Earth's ozone layer

Earth
A composite image of the Western hemisphere of the Earth. Credit: NASA

Several decades ago, chlorofluorocarbons (CFCs) were chemicals used in hairspray, deodorants, foam products, air conditioners and more. In 1974 chemists Sherwood Rowland and Mario Molina published a paper that indicated CFCs were damaging the ozone layer, which protects Earth from the sun's ultraviolet rays.

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 CFCs, and the is on the mend. But the story has taken a new turn as the class of compounds that replaced CFCs act as greenhouse gases.

In this video, Dr. Paul Newman, chief scientist for atmospheric sciences at NASA's Goddard Space Flight Center in Greenbelt, Maryland, discusses the ozone layer's past, present and potential future.

Dr. Paul Newman is the chief scientist for atmospheric sciences at NASA's Goddard Space Flight Center. In this video he discusses chlorofluorocarbons' effects on the ozone layer, what policy-makers did in response, and what challenges the ozone layer faces today. Credit: NASA's Goddard Space Flight Center

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Citation: Video: Earth's ozone layer (2015, April 7) retrieved 25 June 2019 from https://phys.org/news/2015-04-video-earth-ozone-layer.html
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