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The ozone hole opens and closes at each pole, once each year. The record sized ozone hole was a couple of years ago (2006), and the hole every year since has been a bit smaller. No real reason to believe the actions of Man are the cause for the decrease in size, but maybe...

Ozone protects DNA-bearing life from cancer and mutation. Ozone protects organisms with eyes from cataracts. Ozone protection increases crop yields, and increases arable land. Ozone does this by absorbing UV-B from our Sun, which otherwise breaks down DNA.

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