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Remember the ozone hole? It’s back, over the North Pole

Climate change linked to abnormally cold temperatures in the Arctic stratosphere; those conditions result in regional ozone loss These clouds composed of frozen nitric acid and sulphuric acid form when...

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Environment: Antarctic ozone hole closes early this year

Warmer stratosphere, active polar vortex help speed seasonal recovery A graphic from the WMO shows the progression of the Antarctic ozone hole. By Summit Voice FRISCO — Relatively warm stratospheric...

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