Vietnam War Operation POPEYE: Cloud-Seeding, Weaponization of Weather Government Documents

Vietnam War Operation POPEYE: Cloud-Seeding, Weaponization of Weather Government Documents

548 pages of CIA, Department of Defense, and Congressional Documents related to Operation POPEYE, a plan for weather modification through cloud-seeding in Southeast Asia during the Vietnam War
 
During Operation POPEYE the United States used cloud seeding techniques to induce rainfall in an attempt to flood the Ho-Chi-Minh Trail. This operation involved approximately 2,600 flights using 47,000 units of cloud-seeding material in Vietnam, Cambodia, and Laos, in breach of international law. 

After Congressional investigations confirmed the cloud seeding attempts of Operation Popeye in 1973, the US Senate passed a resolution urging President Nixon to initiate negotiations leading to a multilateral treaty. After a year of bilateral negotiations, in 1975 the Soviet Union and the United States submitted separate but identical texts of a draft convention to the UN. Military or hostile uses of such weather modifications were prohibited in 1977.