Tambora Erupts in 1815 and Changes World History (2013)

Well, in 1783-1784, Iceland saw the Laki eruptions which emitted dozens of megatons of material into the upper atmosphere over a period of 8 months. This impacted many parts of the world and caused extreme weather. The end result was a decade of extreme, deteriorated weather with failed crops and hunger across much of Europe and North America. It is theorized that the eruption was an indirect driver for the French Revolution.

[1] https://www.forbes.com/sites/davidbressan/2015/06/08/this-17...

[2] https://www.wired.com/2013/06/local-and-global-impacts-1793-...

> In 1816 a remarkable thing happened—there was no summer weather in much of the Northern Hemisphere. This excerpt from The Year without Summer explains why

Gotta get the book to read the rest. The wikipedia could give you the sparknotes: https://en.wikipedia.org/wiki/Year_Without_a_Summer

You say “one volcano” as if this wasn’t one of the biggest eruptions in recent human history.

To give some perspective... The main eruption was heard as far as 2,600 kilometres away. The estimated energy was more than 4 times that of Krakatoa. Before the eruption it was a mountain 4,300 meters tall. Afterward it had a crater rim with a peak height of 2,850 meters with a crater depth of over 500 meters. It shoved more than a kilometre and a half of mountain into flying debris and produced over 100 cubic kilometres of pyroclastic debris. The eruption lasted for over a month!

It also got right back to building a new tiny volcano in the crater in less than 30 years. It’s one hell of an active volcano!