Australian researchers say the hole in the ozone layer over Antarctica probably would start closing within five years. They say it may be completely closed within fifty years. The ozone layer protects the Earth from dangerous radiation from the sun. The hole in the ozone layer was discovered over Antarctica almost thirty years ago. At the time, it was three times the size of Australia.Chlorine from chlorofluorocarbons, or C-F-C’s, is responsible for destroying part of the ozone layer over Antarctica. C-F-C’s have been widely used since the nineteen-thirties in cooling devices such as refrigerators and air conditioners. C-F-C’s remain in the atmosphere for years.
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