Atmosphere

The persistent white trails left by aircraft at high altitude are condensation trails (contrails) made of ice crystals formed when hot exhaust meets cold, humid air. There is no scientific evidence of any covert large-scale atmospheric spraying program.

HAARP (High-frequency Active Auroral Research Program) is a legitimate scientific facility in Alaska that studies the ionosphere using radio waves. Physicists and atmospheric scientists have consistently explained that HAARP cannot influence weather, as its radio waves do not interact with the troposphere where weather occurs.