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TV Lowell et al., authors of “Testing the Lake Agassiz Meltwater Trigger for the Younger Dryas,” in the 4 October 2005 Eos, are to be commended for re-examining the evidence for the role of meltwater forcing as the cause of the Younger Dryas cooling episode.Yet the article comes up short in attempting to point toward future progress on the important question of the causes of abrupt climate change.

Lowell et al. neglect to address an obvious conundrum: if the Aggasiz meltwater pulse occurred at the wrong time to have caused the Younger Dryas, then it evidently did not cause any significant climate response. Does this not suggest that the assumed importance of meltwater forcing in abrupt climate change be reconsidered entirely?