VOLCANIC WINTER . Solar geoengineering, particularly stratospheric aerosol injection (SAI), mimics the cooling effect of a volcanic eruption by injecting sulfur dioxide into the stratosphere. These aerosols, like those from volcanic eruptions, reflect incoming solar radiation, leading to a temporary decrease in global temperatures. However, volcanic eruptions are natural events, while solar geoengineering is a human-engineered with potential risks and uncertainties. Stratospheric Aerosol Injecti