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:

SYMHC Classics: Olympe de Gouges
36:49

Behind the Scenes Minis: Percy Theories
16:43

Percy Fawcett, Manuscript 512, and a Lost City in the Amazon, Pt. 2
37:10