The Laki Fissure Eruption was a volcanic event in Iceland in 1783 lasted for months, leading to the deaths of thousands of people and affecting the climate in a lot of the world.
Research:

Behind the Scenes Minis: Whoopsy Whimsy
24:41

Great Lisbon Earthquake of 1755
39:02

Benzedrine, Pervitin, and WWII
39:42