Every few months, when the wind's blowing in the right direction, a bottle of air is taken from Kennaook / Cape Grim, at the northern tip of Tasmania, and saved for science. Here's how and why.
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Illegal CFC emissions have stopped since scientists raised alarm
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More evidence points to China as source of ozone-depleting gas
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Ozone hole mystery: China insulating chemical said to be source of rise
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Scientists race to find who is pumping dangerous gas CFC-11 (depletes ozone and a greenhouse gas) into the atmosphere
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Someone, somewhere, is making a banned chemical that destroys the ozone layer, scientists suspect
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