evidence: While it is possible to change the Earth’s long-term climate through elevated atmospheric greenhouse gases, humans lack the scientific, technological, and logistical capabilities to control short-term weather events at the global scale. There is no evidence for the existence of chemtrails, nor for their claimed impact on global atmospheric chemical composition and physical properties. The Sun drives weather and sends far more energy to Earth than ionosphere heating facilities like HAARP can transmit. These facilities are radio transmitters that can only excite small areas of the ionosphere directly above them, whereas weather occurs primarily in the troposphere and all over the planet.