The definitive cause of La Nina and El Nino events

Abstract

Rather than being strictly random events, it has been proven that all La Ninas and El Ninos are caused by the increase or decrease of reflective SO2 aerosols in Earth’s atmosphere, from both volcanic eruptions and industrial activity. Although volcanic eruptions are random events, an eruption usually signifies a forthcoming La Nina/El Nino cycle, and thus can have some predictive value.