1. Department of Earth Sciences, University of Bristol, UK
   e-mail: mark.siddall@bristol.ac.uk
2. Lamont Doherty Earth Observatory, Palisades, New York 10964, USA.

Abstract

The vast Laurentide ice sheet once covered the northern reaches of the American continent. A combination of geological data and climate simulations suggests that it dwindled faster than has been projected for Greenland's ice over the next century.

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