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Ocean acidification refers to the long-term decrease in the pH of seawater caused primarily by the absorption of atmospheric carbon dioxide (CO₂). When CO₂ dissolves into the ocean, it forms carbonic acid, which lowers pH and reduces the availability of carbonate ions—key building blocks that shell-forming organisms need. Although pH changes may seem small on paper, even a tenth of a unit is meaningful in biological terms, disrupting chemical equilibria and sensitive life stages across many species.

One of the most visible impacts is on calcifying organisms like corals, oysters, clams, and certain plankton such as coccolithophores and pteropods. These organisms rely on carbonate ions to build calcium carbonate structures. As carbonate becomes scarcer, shells thin, growth slows, and survival during larval stages declines. Coral reefs are hit doubly hard: acidification weakens their skeletons while warming drives bleaching, leaving less time for recovery between stress events.

The effects cascade through food webs. Tiny plankton weakened by acidification can reduce prey quality for fish, which in turn affects seabirds and marine mammals. Fisheries that depend on robust shellfish recruitment—such as oyster and mussel farms—face higher mortality during hatchery stages, translating into economic losses and regional job insecurity. Indigenous and coastal communities that rely on subsistence or small-scale fisheries are especially vulnerable, because alternatives may be limited.

Chemical changes also alter behavior and physiology. Some fish species show impaired sensory abilities under more acidic conditions, affecting predator avoidance and homing. Acidification can interact with other stressors—warming, deoxygenation, and pollution—creating compound risks that are harder to predict and manage. Because these stressors often co-occur, successful policy will need to address multiple drivers at once rather than treating acidification in isolation.

Mitigation starts with reducing global CO₂ emissions, the root cause. Locally, managers can enhance resilience by protecting seagrass meadows, salt marshes, and mangroves that uptake carbon and buffer pH at small scales. Aquaculture hatcheries can monitor water chemistry and add buffering agents during vulnerable life stages. Finally, adaptive fisheries management—such as adjusting harvest limits and diversifying target species—can spread risk as ecosystems reorganize. Ocean acidification is not a distant, abstract trend; it is a current, measurable shift in ocean chemistry with tangible ecological and economic consequences, and it will track our choices on carbon for decades to come.