Dec. 22, 2008 -- Volcanic eruptions have periodically cooled the tropics over at least the last 450 years by spewing out particles that girdle the world at high altitude and reflect sunlight, according to a study released Sunday.
The research adds a chunk of regional evidence to earlier work that found major eruptions -- such as Krakatoa, Indonesia, in 1883 and Huaynaputina, Peru, in 1600 -- contribute to cooling on a worldwide scale.
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