9:20 PM Thu 13 May 2010 GMT
This week British Antarctic Survey (BAS) commemorates the 25th anniversary of one of its most dramatic scientific discoveries - the ozone hole. In May 1985 reporting in Nature Joe Farman, Brian Gardiner and Jonathan Shanklin described their observations of large losses of ozone over Antarctica. In this week's Nature Jonathan Shanklin reflects on how the discovery was made and what lessons were learnt. As part of the anniversary commemorations Jonathan Shanklin appears alongside Nobel Prize winner Paul Crutzen and leading US scientists David Fahey and Susan Solomon at a special international symposium organised by Cambridge University on Friday 7 May.
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by British Antarctic Survey
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