Could captured carbon dioxide be stored in the deep ocean?

Asked by: Mark Cooper, Manchester

Capturing carbon dioxide (CO₂) to stop it boosting global warming seems a good idea, but raises the problem of where to store the stuff. One low-cost solution is simply to pump it into the deep ocean, but CO₂ is toxic to marine life and would also combine with the seawater to produce an acid, which would pose unknown environmental risks. Underground or sub-seabed storage are thought be less risky options.

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