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A study has documented an unprecedented depletion of Earth's protective ozone layer above the Arctic last winter and spring caused by an unusually prolonged period of extremely low temperatures in the stratosphere. The study finds the amount of ozone destroyed in the Arctic in 2011 was comparable to that seen in some years in the Antarctic. The stratospheric ozone layer protects life on Earth from the sun's harmful ultraviolet rays. [Source: NASA Jet Propulsion Laboratory]
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