the hole in the ozone layer(2)
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TRANSCRIPT
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The Ozone layer hole
and its consequences…
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Planet earth is vulnerable to negative human action
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The ozone layer protects us from the sun's ultraviolet radiation
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O2 + UV → 2 OO2 + O → O3
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In 1985 the Ozone layer hole was revealed:
it was drastically growing in size and rate.
Academic publications increased progressively during the 1990s.
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Because…
90% of the Ozone is located in the Stratosphere between 10 and 50 km above the earth's surface …
… and it is transparent as well
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WHY is the Ozone layer being destroyed?
man-made chlorofluorocarbons (CFCs) are the main cause for Ozone layer depletion
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HOW?
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WHERE?
The Ozone layer hole is mainly located above the Antarctic
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Consequences …
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CFCs greatly contribute to global warming
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Exposure to ultraviolet radiation could result in skin cancer
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Worldwide Melanoma of Skin Cancer Incidence
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There is some good news as well…
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Montreal Agreement
• 1987 international treaty• Signed and ratified by 195 countries• Sharply reduced CFCs worldwide• Full recovery not before 2050
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In 2010 the size of the Ozone layer hole was the 2nd smallest in over a decade
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So what do we learn?
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