| Summary: | A countermeasure to global warming is removing high CO<sub>2</sub> amounts from the atmosphere and locating the emitted CO<sub>2</sub> into long-term stable carbon storage sites. The sequestration technologies must be reliable, long-lasting, and environmentally friendly. An alternative and innovative approach that may meet the sequestration requirements is CO<sub>2</sub> storage as clathrate hydrates in marine environments. Extensive research has been devoted to CO<sub>2</sub>-CH<sub>4</sub> replacement in natural gas hydrates. Another option is the direct formation of CO<sub>2</sub> hydrates into deep ocean water or into marine underfloor sediments. This article deals with the positioning of direct hydrate-based CO<sub>2</sub> storage among the other traditional geological options and the discussion of new, by-far, state-of-the-art knowledge required for the development of a hydrate-based CO<sub>2</sub> storage pathway that is reliable, stable, durable, efficient, and environmentally benign.
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