How can we make carbon capture & storage more sustainable and cost-effective?

One short-term avenue by which we can significantly reduce the amount of CO2 emitted into the atmosphere by power plants is to capture it and then either store it somewhere (from where they cannot escape back into the atmosphere). But carbon capture and storage has had a rather patchy record so far with none of the pilot efforts migrating to large scale commercialization. What are the innovations in technologies and solutions through which CO2 capture & storage can be made more technically and economically feasible?

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