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The success of the International Geophysical Year (IGY) effort led to the signing (1959) of the Antarctic Treaty by representatives of the 12 nations that had been involved in the IGY. The treaty prohibits military operations, nuclear explosions, and the disposal of radioactive wastes in Antarctica and provides for cooperation in scientific investigation and the exchange of scientific data. In 1991, 24 nations signed a protocol to the 1959 treaty barring for 50 years the exploration of Antarctica for oil or minerals. The accord also contained provisions covering wildlife protection, waste disposal, and marine pollution. The treaty, which now has 46 member nations, did not end national claims to Antarctica, and in the 21st cent. claimant nations extended their claims over the continental shelf offshore to the maximum (350 nautical mi) allowed by international law.
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