The Volcanic winter reference article from the English Wikipedia on 24-Apr-2004
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Volcanic winter

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A volcanic winter is the reduction in temperature caused by volcanic ash and droplets of sulfuric acid obscuring the sun, usually after a volcanic eruption (hence the name). The explosion of Krakatoa in 1883 precipitated just such a condition; the next four years were unusually cold, and the winter of 1888 was the first time it was warm enough to snow; snowfalls that year broke all records worldwide.

See also: nuclear winter

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