Which volcanic eruption is linked to one of the biggest climate impacts in history?

Mount Tambora’s 1815 eruption injected huge amounts of sulfur dioxide and ash into the stratosphere. This created a veil that reflected sunlight and contributed to global cooling. The following year, 1816, brought unusual frosts, snow in summer, and widespread crop failures in parts of Europe and North America. Historians and climatologists still study Tambora because it is the clearest example of how a single volcano can affect global climate.