"And the "covert operation" could allegedly cause biblical style floods that will pour down toxic chemicals including lead and mercury leaving catastrophic results.
US eco expert Michael Tamez says the little trails of clouds that you see left behind by jet aircraft are more sinister than the average human realises.
And that it's all to do with "Stratospheric Aerosol Geoengineering" that is being kept secret from the public.
Explaining the theory, he says that there's no way the line-like clouds that are left by aircraft are responsible for the long lasting patterns in the skies.
He told Express.co.uk: "They’re long trails of cirrus clouds that stretch across the horizon and then spread out across the sky.
"After about a half hour or so, they begin to appear foggy and disappear into the air.
"It cannot be jet exhaust either since normal jet fuel contrail dissipates within seconds after the aircraft has passed."
Mr Tamez, who has written a number of books and is an environmental expert, says Chemtrails have been used for more than three decades.
But that they could lead to absolute devastation.
He added: "These cloudlike trails are known as Stratospheric Aerosol Geoengineering.
"It’s a covert global operation of chemical spraying technology designed to deliver sulfide gasses to the earth’s atmosphere to control the amount of carbon dioxide present.
"This technology has been in use since the 1980’s."