History’s greatest conspiracy theories
Chemtrail conspiracy theorists believe that some contrails, which consist of ice crystals or water vapor condensed behind aircraft, actually result from chemicals or biological agents being deliberately sprayed at high altitude for some undisclosed purpose. The staple of right-wing radio shows in the US, there is fevered speculation that the chemicals being sprayed are part of a wider plot that involves the so-called New World Order and is being directed by shadowy forces within the government. The existence of chemtrails has been repeatedly denied by federal agencies and scientists.
From our very good friends over at telegraph.co.uk