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The '''Chemtrails''' [[conspiracy theory]] claims that some [[contrails]], visible in the Earth's atmosphere, are biological or chemical agents, sprayed at high altitudes for reasons unknown to the public. There are many versions of the theory that propose different explanations, similar to how [[Urban legend|urban legends]] are spread.

The '''Chemtrails''' [[conspiracy theory]] claims that some [[contrails]], visible in the Earth's atmosphere, are biological or chemical agents, sprayed at high altitudes for reasons unknown to the public. There are many versions of the theory that propose different explanations, similar to how [[urban legend]]s are spread.

The conspiracy theory, however, has never found any credit in the scientific community, as it is devoid of objective evidence. What advocates of the theory identify as "chemtrails" are normal condensation trails (contrails), which under certain weather conditions take an unusual appearance.

The conspiracy theory, however, has never found any credit in the scientific community, as it is devoid of objective evidence. What advocates of the theory identify as "chemtrails" are normal condensation trails (contrails), which under certain weather conditions take an unusual appearance.