COVER The pteropod Clio pyramidata, a common planktonic mollusk with a calcium carbonate shell. The oceanic uptake of CO₂ released to the atmosphere from human activities is changing seawater chemistry (see page 367). These changes make calcium carbonate shells dissolve at shallower depths and ultimately may impair the ability of pteropods, corals, and other marine organisms to calcify (see page 362). [Photo: R. W. Gilmer and G. R. Harbison]

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