In 2016, John Brennan, then US Central Intelligence Agency Director, told the Council of Foreign Relations that stratospheric aerosol injection, or SAI, was both a potential benefit as well as a potential threat. “Global norms and standards are lacking to guide the deployment and implementation of SAI and other geoengineering initiatives,” he said.
Geoengineering is a controversial science of manipulating the climate for the stated purpose of fighting man-made climate change. There are several types of geoengineering, including Solar Radiation Management (“SRM”) or solar geoengineering. SAI is a specific solar geoengineering practice which involves spraying aerosols into the sky. One method of spraying aerosols is from aeroplanes. The persistent jet emissions, usually seen as white trails left behind as aeroplanes fly through the sky, are called chemical trails, commonly known as chemtrails.