Solution found for carbon dioxide emission?

We have heard many crazy ideas to abide Kyoto Protocol, a set of CO₂ emission caps for different countries. One way is to find storages for the CO₂ we are producing. Say, underground old mines have been proposed, but a big earthquake could release the CO₂ in days and cause an environmental disaster. Researchers from Harvard, MIT, and Columbia brought up a very good idea: injecting CO₂ into deep-sea sediments (see their PNAS paper "Permanent carbon dioxide storage in deep-sea sediments"): “At the high pressures and low temperatures common in deep-sea sediments, CO₂ resides in its liquid phase and can be denser than the overlying pore fluid, causing the injected CO₂ to be gravitationally stable.” How much can we store? “The total CO₂ storage capacity within the 200-mile economic zone of the U.S. coastline is enormous, capable of storing thousands of years of current U.S. CO₂ emissions.” Besides, the gas will stay there forever unless an asteroids hit us.