Check out the stark difference between these two satellite images, taken on March 19, 2010 and March 19, 2011. The left image shows much more ozone (in red) over the Arctic than the right image. What's happened?
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Source: http://feeds.gawker.com/~r/gizmodo/full/~3/gbiwfmGGaf0/arctic-ozone-levels-dropped-by-as-much-as-half-in-the-past-year
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