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1976 Convention on the Prohibition of Military or Any Other Hostile Use of Environmental Modification Techniques (ENMOD Convention)

Published May 18, 1977

This treaty prohibits “environmental modification”, defined in the treaty as "any technique for changing - through deliberate manipulation of natural processes - the dynamics, composition or structure of the Earth, including its biota, lithosphere, hydrosphere and atmosphere, or of outer space." It entered into force on October 5, 1978.