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It is with great sadness and even greater respect that we mourn the passing of Wallace S. Broecker. To say that Wally’s work led to significant advancements in ocean sciences and climate change is a gross understatement. It is hard to imagine oceanography without Wally as a source of ideas beyond count, a voice to bring understanding of the ocean and the carbon cycle to the forefront of public policy, and a spirited antagonist who goaded the rest of us to work both more creatively and more rigorously.