Chemtrails

Chemtrails is the name given to those streaks of white or gray vapors from aircraft that linger longer that one would expect normal contrails or vapor trails to persist.

They are thought to contain a variety of compounds that have functions ranging from blocking sunlight, to manipulating weather, to exerting subtle effects on the nervous system.

Interview with an Air Force veteran

"Most of the Geo engineering taking place in our skies is not implemented by special spray planes. Barium salts, aluminum oxide, and other toxic compounds are added to the jet fuel at the industrial level. Under a US Department of Energy/UN program in operation since 1993 passenger jet aircraft are used to disseminate the agents into the atmosphere through the jet engines." -- Alex Jones