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A false-color view of total ozone over the Antarctic pole is seen in this NASA handout image released October 24, 2012. REUTERS/NASA

Scientists still waiting for clear signs of ozone hole healing

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By Irene Klotz

SAN FRANCISCO - 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.

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