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Volcano-Ice Age Link Discounted

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Science  10 May 1996:
Vol. 272, Issue 5263, pp. 817
DOI: 10.1126/science.272.5263.817

Summary

Modern volcanic eruptions are dwarfed by the massive eruption of Toba, on the island of Indonesia, about 70,000 years ago. According to some theories, fallout from that giant blast cooled the Earth, decimating early human populations and driving the climate system into an ice age. Those hypotheses are put to the test by a year-by-year climate record buried in Greenland ice—and the results show that Toba wasn't such a climatic catalyst afterall.