Only in the north
It is not clear in the fine article on volcanoes (“Disaster goes global,” SN: 8/30/08, p. 16) how dust from the eruption of Huaynaputina, well south of the equator, in 1600 could affect only the Northern Hemisphere.
David Bronson, Biddeford Pool, Maine
For one thing, there’s less real estate in the Southern Hemisphere to have been affected.
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