Rare Super-Eruption of Volcanoes Can Cause Catastrophic Effects to Global Climate

About 5 to 10 volcanoes around the globe are believed to be capable of causing a super-eruption that might have devastating consequences for the global climate. One of them is positioned under the waters of Sumatra's Lake Toba and has prompted two impactful eruptions in the past million years. But when is the next one happening? Will there be any signs of impending doom?