Internet makes people stupid ! Chemtrail conspiracy theories emerged in the late 1990s after publication of a 1996 United States Air Force (USAF) report on weather modification, with the Air Force accused of secretly spraying substances via aircraft. The theories spread through internet forums and were popularised by radio host Art Bell from 1999.Chemtrails have been dismissed by the scientific community. There is no evidence that purported chemtrails differ from normal water-based contrails routinely left by high-flying aircraft under certain atmospheric conditions. Proponents have tried to prove that chemical spraying occurs, but their analyses have been flawed or based on misconceptions. 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!The chemtrails theory has circulated since 1996, when conspiracy theorists misinterpreted a U.S. Air Force research paper about weather modification, a valid topic of research.The first published reports of contrails appeared during and shortly after World War I when aircraft were finally able to reach the altitudes required for contrail formation.
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