If you want to lock up carbon, just add limestone

摘要

Speeding up part of the ocean's natural carbon cycle might help slow global warming. That's the thinking behind a plan to lock up carbon dioxide from power plant emissions by mixing the gas with limestone and seawater, and then dumping it in the ocean. Carbon dioxide in the atmosphere normally mixes with seawater at the ocean's surface to form carbonic acid. From there it is slowly circulated to the sea floor, where it reacts with sediments to form" relatively inert calcium bicarbonate.