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Nature 372, 421 - 424 (01 December 1994); doi:10.1038/372421a0

Massive iceberg discharges as triggers for global climate change

Wallace S. Broecker

Lamont-Doherty Earth Observatory, Columbia University, Route 9W, Palisades, New York 10964, USA.

Observations of large and abrupt climate changes recorded in Greenland ice cores have spurred a search for clues to their cause. This search has revealed that at six times during the last glaciation, huge armadas of icebergs launched from Canada spread across the northern Atlantic Ocean, each triggering a climate response of global extent.

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