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Glossary beginning with O

O

Ocean Acidification

Increased concentrations of CO2 in sea water causing a measurable increase in acidity (i.e., a reduction in ocean pH). This may lead to reduced calcification rates of calcifying organisms such as corals, mollusks, algae and crustacean.

[IPCC Fourth Assessment, Working Group II, Appendix I Glossary, p. 879]