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