was cooling, which makes its recovery more difficult.
Shanklin, one of three scientists to discover the Antarctic ozone hole in 1985, told BBC Radio: "It's getting colder because of the greenhouse gases that are being liberated by all the emissions we have at the surface.
"We think that within the next 20 years we are likely to see an ozone hole perhaps as big as the present one over Antarctica but over the North Pole."
This year's Antarctic hole was the largest ever recorded. It reached as far as the Falkland Islands and the tip of South America where people were warned to protect themselves against the Sun's harmful ultraviolet radiation.
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