Chemtrails - Mythe ou réalité ?

Everyone has already noticed the white condensation trails (contrails) created by airplanes in flight. However, it is claimed that some of them, much less harmless, would in fact be composed of chemical or biological agents deliberately spread at high altitude by various government agencies for reasons hidden from the general public. These chemical trails (chemtrails) are very successful in conspiracy circles. Are we being hidden a dark reality?

During this conference, aerodynamic...