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We are grateful for funding from the Natural Sciences and Engineering Research Council via the operating and Climate System History and Dynamics programs and for research support from the Canadian Foundation for Climate and Atmospheric Sciences. This research was also made possible through support from the Killam Foundation and the Canada Research Chair program to A.J.W. and from the Earth System History Program of NSF to P.U.C. We also acknowledge discussions with J. Gregory and M. Kienast and are grateful for the insightful comments of two anonymous reviewers.
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