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The Nation

June 23, 1986

The National Science Foundation said it is flying four teams of scientists to Antarctica in the dead of winter to try to find out what is causing a dramatic "hole" in the ozone radiation shield above the frozen continent. About half of the ozone above a broad area of Antarctica has been disappearing every spring since the mid-1970s and researchers do not know if it is an early warning sign of changes for the entire planet or whether it is just a local phenomenon. Ozone, a form of oxygen, filters out harmful amounts of ultraviolet radiation from the sun.

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