Transcription: Amounts of ozone over the Antarctic vary naturally, but measurements taken in recent years have indicated a serious problem. These computer images show ozone levels during the 1970s and 80s. Red indicates a high concentration. As you can see, the levels decreased markedly during the 1980s until finally a central zone was left with almost no ozone at all. ozone hole. This hole seems to be getting larger in area each year and is already affecting Australia and Chile.
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