The chemtrail conspiracy theory posits that the condensation trails (contrails) left by aircraft are actually chemical or biological agents deliberately sprayed for nefarious purposes, such as weather modification, population control, or other undisclosed government agendas. Proponents of this theory believe that the trails are not merely the result of water vapor condensing at high altitudes and that they contain harmful substances. The theory gained popularity in the late 1990s and has persisted despite scientific evidence to the contrary.
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