I may have just solved one of geology's greatest open mysteries. In 1808, a massive volcanic eruption occurred which lowered temperatures around the planet. Yet, seemingly no one noticed the eruption although many felt its effects. This video makes the case for the volcano of origin being a specific unnamed submarine volcano located off the coast of Tonga. It has clearly produced a major explosive eruption in the last 250 years.
Sources:
https://research-information.bris.ac.uk/ws/files/124748345/cp_10_1707_2014.pdf
https://volcano.si.edu/volcano.cfm?vn=243011
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