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miércoles, 09 de diciembre de 2009

Unlayering of the Ozone: An Earth Sans Sunscreen

UN Chronicle - New York, NY, USA.

...Chlorofluorocarbons and allied substances are very stable, so their atmospheric concentration drops very slowly and will not reduce to pre-ozone hole values until at least 2070. It is likely to be several more years before we can be confident that the ozone hole is shrinking and many decades before spring-time ozone levels return to those of the early 1970s...

Modificado el ( jueves, 07 de enero de 2010 )
 
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