Ocean acidification is a consequence of increasing emissions of carbon dioxide (CO ₂ ), a greenhouse gas that causes climate change. The ocean absorbs about one-third of all CO ₂ human-induced, causing a change in seawater chemistry called ocean acidification. It poses a serious threat to marine life, the health of ecosystems and the people whose livelihoods depend on the ocean. When the CO ₂ dissolves in seawater, forms carbonic acid (H ₂ WHAT ₃ ), releasing hydrogen ions (H+) and increasing the acidity of the oceans. Acidity plays a key role in many biological mechanisms, including calcification. (Vladimir Tarakanov)

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