For example, significant cooling and strong dynamical effects after the Laki event and other high-latitude eruptions are believed to have caused decreased flow of the Nile River in Egypt and weakened African and Asian monsoons based on climate model simulations, with potentially very significant impacts on food and water supplies.

CNN: How volcanoes can change the world

Benjamin Franklin was one of the first to suggest that the extreme cold of 1783-84 over much of the Northern Hemisphere was connected to the Laki event.

CNN: How volcanoes can change the world