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ozone layer
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ozone layer


seasonal thinning of the ozone layer
  a layer in the stratosphere (roughly  20 miles up) containing enough ozone to block most ultraviolet radiation from the sun
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Strongly Associated with:   ozone
Notes:
On January 23, 1978, Sweden became the first nation to ban CFC-containing aerosol sprays that are thought to damage the ozone layer. A few other countries, including the United States, Canada, and Norway, followed suit later that year, but the European Community rejected an analogous proposal. Even in the U.S., chlorofluorocarbons continued to be used in other applications, such as refrigeration and industrial cleaning, until after the discovery of the Antarctic ozone hole in 1985. After negotiation of an international treaty (the Montreal Protocol), CFC production was sharply limited beginning in 1987 and phased out completely by 1996.

On August 2, 2003, scientists announced that the depletion of the ozone layer may be slowing down due to the international ban on CFCs. Three satellites and three ground stations confirmed that the upper atmosphere ozone depletion rate has slowed down significantly during the past decade. The study was organized by the American Geophysical Union. Some breakdown can be expected to continue due to CFCs used by nations which have not banned them, and due to gases which are already in the stratosphere. CFCs have very long atmospheric lifetimes, ranging from 50 to over 100 years, so the final recovery of the ozone layer is expected to require several lifetimes.

http://en.wikipedia.org/wiki/Ozone_layer  (retrieved 9/26/08)
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Samples:
  • seasonal thinning of the ozone layer
  • Governments have long cooperated to protect the ozone layer.
  • Zeus’s gaze was as far away as the ozone layer.
    Rick Riordan  --  The Blood of Olympus
  • They also knew radiation levels were higher beyond the ozone layer.
    Rebecca Skloot  --  The Immortal Life of Henrietta Lacks

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  • "Hey, Mrs. P.! I think we found the answer to our problems for the ozone layer depletion," Alex teases.
    Simone Elkeles  --  Perfect Chemistry
  • The modem world was changing fast, and urgent questions about the weather, deforestation, global warming, or the ozone layer often seemed answerable, at least in part, with information from the past.
    Michael Crichton  --  Jurassic Park
  • Diesel emissions are one of the largest contributors to the destruction of the ozone layer.
    Meg Cabot  --  The Princess Diaries
  • Since there was no oxygen in the atmosphere, there was no protective ozone layer around the earth.
    Jostein Gaarder  --  Sophie’s World
  • It didn’t have all-wheel drive, which was a real pain in the neck during a New Hampshire winter, but I figured that saving the ozone layer was worth sliding off the road occasionally.
    Jodi Picoult  --  Change of Heart
  • That was a piece of cake next to guns and gangs and sexually transmitted diseases, not to mention the things parents had to be concerned about: pedophiles on the Web, designer drugs like ecstasy, school shootings, anorexia, bulimia, self-mutilation, the ozone layer, superbacteria.
    Amy Tan  --  The Bonesetter’s Daughter

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  • Let’s blame the Cold War and the hostage situation in Iran and the depletion of the ozone layer on Kemp.
    Stephen King  --  Cujo
  • Of course, by then we won’t be able to go outside because we’ll get fried by the lack of ozone layer," I said, getting worked up.
    James Patterson  --  Saving the World and Other Extreme Sports
  • Hammond said, "Well, if the ozone layer gets thinner-"
    Michael Crichton  --  Jurassic Park
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Associated words [difficulty]:   ozone layer [7] , ozone [5] , John Muir [8] , greenhouse gas [8] , greenhouse effect [8] , greenhouse gas [8] , greenbelt [9] , red tide [9]
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Most commonly used in these subjects:   Nature & Ecology, Public Policy & Politics, Business, Science
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