Ocean acidification
The ocean has absorbed so much CO₂ that surface water is 30–40% more acidic than before industrialisation. In 2025 scientists declared this planetary boundary crossed.
How this affects people
About a quarter of human CO₂ emissions dissolve into the sea, forming carbonic acid. That slows warming — but changes ocean chemistry.
More acidic water makes it harder for corals, shellfish and plankton to build shells and skeletons, rippling through the food web to fisheries.
Look at what keeps the problem going
- 01CO₂ emissions absorbed by seawater
- 02Cold polar waters absorbing CO₂ fastest
- 03Coastal nutrient pollution adding local acidification
What could happen next
The future leaves room for choices. Compare the outlooks, check what supports them and notice where the evidence becomes less certain
Acidity keeps rising with emissions
Ocean chemistry tracks atmospheric CO₂; there is no short-term pause.
The future is not a timetable. These summaries reflect published scenarios and trends, with deeper uncertainty at longer horizons. Choices made now matter.
Where could a useful response begin?
Begin with a question you can investigate. Compare the sources and follow related briefings to see how the problem connects to other lives and places. This prototype does not accept proposals yet.
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