[TEP_Kim_Il_Sung]

Surely some volcanoes have ejected a fair amount of sulfur into the environment? How was the local weather affected by them?

[sofixa]

Global weather has been impacted to such extents (resulting in multiple massive famines) that there's even a term for that - volcanic winter.

[TEP_Kim_Il_Sung]

Surely you jest; Only Man could affect global weather!

[kolinko]

If I remember correctly, there was a mini-ice aga in medieval times because of an erruption that was significant enough.

[defgeneric]

The 1991 eruption of Mount Pinatubo is often cited.

https://en.wikipedia.org/wiki/1991_eruption_of_Mount_Pinatub...

[numbsafari]

Ask the dinosaurs.