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Storing co2 under the sea? Imagine what a leaking well will look like: a giant soda straw injecting c02 directly where it can do the most damage.

Carbon storage may be a stop-gap but, as with "clean coal", is also used as a pr flag to justify continued fossil fuel expansion. With the price of solar dropping, that is where we should focus (and fusion).

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The point of this article is that the injected CO2 reacts with the rocks to create stable solids, so that it can't leak even if the physical containment fails after a few years. That is a significant improvement over e.g. schemes to inject CO2 in depleted oil fields, where physical containment failure would indeed undo all the benefits of sequestration.

Except for when the pipe breaks, much like every oil-related accident. Pipes +ocean +pressure always creates risks.

Except that we control the flow into the pipe and can turn it off in a minute, unlike every oil-related accident.

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