Chemtrail conspiracy theory
Conspiracy theory about contrails / From Wikipedia, the free encyclopedia
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The chemtrail conspiracy theory /ˈkɛmtreɪl/ is the erroneous[1] belief that long-lasting condensation trails left in the sky by high-flying aircraft are actually "chemtrails" consisting of chemical or biological agents, sprayed for nefarious purposes undisclosed to the general public.[2] Believers in this conspiracy theory say that while normal contrails dissipate relatively quickly, contrails that linger must contain additional substances.[3][4] Those who subscribe to the theory speculate that the purpose of the chemical release may be solar radiation management,[3] weather modification, psychological manipulation, human population control, biological or chemical warfare, or testing of biological or chemical agents on a population, and that the trails are causing respiratory illnesses and other health problems.[2][5]
The claim has been dismissed by the scientific community.[6] There is no evidence that purported chemtrails differ from normal water-based contrails routinely left by high-flying aircraft under certain atmospheric conditions.[7] Proponents have tried to prove that chemical spraying occurs, but their analyses have been flawed or based on misconceptions.[8][9] Because of the conspiracy theory's persistence and questions about government involvement, scientists and government agencies around the world have repeatedly explained that the supposed chemtrails are in fact normal contrails.[3][10][11]
The term chemtrail is a portmanteau of the words chemical and trail, just as contrail blends condensation and trail.[12]