how are the global effects of local environmental disasters?
An excellent example of this would be the Mount Pinatubo eruption in 1991. The specific nature of this eruption features massive amounts of aerosols and ash put into the atmosphere. When Mount Pinatubo erupted, the amount of dust and ash it injected into the atmosphere was responsible for a worldwide reduction in temperature of 0.5–0.6 °C in the northern hemisphere over the next year, as well as a massive increase in ozone depletion.