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Posted Tue Dec 17 2013: from
Reuters:
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Scientists still waiting for clear signs of ozone hole healing http://apocadocs.com/s.pl?1387313550
Earth's upper atmosphere is still so saturated with ozone-eating chlorine that it will take about another decade for evidence that a nearly 25-year-old ban on such destructive chemicals is working, scientists said.
Full recovery of the ozone layer, which shields Earth from the sun's harmful ultraviolet radiation, should occur around 2070... Researchers report puzzlingly large variations in the size of the annual ozone hole over Antarctica.
In 2012 for example, the ozone hole was the second smallest on record, an apparently positive sign that the 1989 Montreal Protocol agreement - which called for the phasing out of Freon and other damaging chlorofluorocarbons, or CFCs - was working.
But scientists say that meteorological effects masked the hole's true size. The year before, they point out, the ozone hole was nearly as big as it was in 2006, the largest on record.
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