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While carbon dioxide is probably best known for its contribution to anthropogenic climate warming, it is also a major contributor to acid rain and, in turn, lower pH in all the world’s surface waters, including its oceans. Shellfish, with their easily dissolved shells of calcium carbonate, are particularly susceptible to the depredations of acidic waters. Besides the threat to the species and ecosystems themselves, the ramifications of this for the Pacific Northwest’s shellfish industry are broad and troubling. The Oregonian elaborates: http://www.oregonlive.com/environment/index.ssf/2015/02/national_ocean_acidification_s.html