iONiUM writes "The BBC reports that 'Ozone loss over the Arctic this year was so severe that for the first time it could be called an "ozone hole" like the Antarctic one, scientists report. About 20km (13 miles) above the ground, 80% of the ozone was lost, they say. The cause was an unusually long spell of cold weather at altitude. In cold conditions, the chlorine chemicals that destroy ozone are at their most active.' This is the first time in observational history that the Arctic ozone has been depleted to such extensive levels (abstract). This will mean high UV problems for Russia, Greenland and Norway."
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