Secure seafloor container CO2 storage

Oceans, islands, and coastal areas are at least as threatened by humanity's rapidly increasing atmospheric greenhouse gas concentrations as the remaining 30% of Earth's surface. Yet most of the discussion for sequestering the dominant greenhouse gas, CO
2
, involves deep sub-earth geologic structures limited to relatively small areas in continental plates. Humanity needs a secure carbon storage alternative that is available in more countries. Secure Seafloor Container Storage (SSCS) is an alternative that could safely store trillions of tons of CO
2
. The paper presents a computational geophysical, chemical, and economic model of SSCS. Our research shows that appropriate undisturbed geosynthetics will prevent contact with seawater for millennia (<0.06% osmosis loss per millennium). CO
2
hydrate below 500 meters is a rock-like solid denser than water. Our life cycle assessment predicts a mass ratio of stored-CO
2
: materials needed of 1,700∶1. The projected cost to compress pure gaseous CO
2
to a liquid, convert the liquid to hydrate inside a geosynthetic membrane, monitor and maintain the structures is approximately $16 per ton of CO
2
.