We have heard many crazy ideas to abide
Kyoto Protocol, a set of CO
2 emission caps for different countries. One way is to find storages for the CO
2 we are producing. Say, underground old mines have been proposed, but a big earthquake could release the CO
2 in days and cause an environmental disaster. Researchers from Harvard, MIT, and Columbia brought up a very good idea: injecting
CO
2 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, CO
2 resides
in its liquid phase and can be denser than the overlying pore
fluid, causing the injected CO
2 to be gravitationally stable.” How much can we store? “The total CO
2 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. CO
2 emissions.” Besides, the gas will stay there forever unless an asteroids hit us.