Researchers have identified the **1831 eruption** of a previously unknown volcano that significantly cooled the **Earth's climate**.
This eruption released **sulfur dioxide**, causing average temperatures in the Northern Hemisphere to drop by approximately **1 degree Celsius** (1.8 degrees Fahrenheit).
The volcano is now linked to the **Zavaritskii volcano** on Simushir Island, part of the Kuril Islands, using **ice core sampling** from Greenland.
Prior to this study, Zavaritskii was thought to have last erupted in **800 BC**, making its 19th-century activity surprising to researchers.
The climatic effects of this eruption contributed to the **end of the Little Ice Age**, leading to reported famines across **India, Japan, and Europe**.
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