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The Convention on the Prohibition of Military or Any Other Hostile Use of Environmental Modification Techniques (Geneva: 18 May 1977, Entered into force: 5 October 1978) prohibits "widespread, long-lasting or severe effects as the means of destruction, damage or injury". However it has been argued that this permits "local, non-permanent changes".
Prior to the Geneva Convention, the United States used weather warfare in the Vietnam War. Under the auspices of the Air Weather Service, the United States' Operation Popeye used cloud seeding over the Ho Chi Minh trail, increasing rainfall by an estimated thirty percent during 1967 and 1968. It was hoped that the increased rainfall would reduce the rate of infiltration down the trail.
A research paper produced for the United States Air Force written in 1996 speculates about the future use of nanotechnology to produce "artificial weather", clouds of microscopic computer particles all communicating with each other to form an intelligent fog that could be used for various purposes. "Artificial weather technologies do not currently exist. But as they are developed, the importance of their potential applications rises rapidly." Weather modification technologies are described in an unclassified academic paper written by airforce officer-cadet students as "a force multiplier with tremendous power that could be exploited across the full spectrum of war-fighting environments." 
- Environmental Warfare and Climate Change Michel Chossudovsky.
- Transcript of the US Senate Hearing on Weather Modification of March 20, 1974
- House, Tamzy J.; et al. "Weather as a Force Multiplier: Owning the Weather in 2025" (PDF). US Air Force. Retrieved April 17, 2012.
- Non Lethal Warfare Proposal:Weather Modification, The Sunshine Projectpurposes.
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