Abstract: A system and method for producing and purifying alkalinity for addition to a body of water for decreasing the CO2 burden of an atmosphere that is in contact with a body of water using an alkaline mass to increase dissolved alkalinity of the body of water without increasing the concentration of undesirable metals to undesirable levels in the body of water may include chemically characterizing the alkaline mass, contacting the alkaline mass with a volume of water, leaching the alkaline mass with the volume of water to form an alkaline leachate, maintaining in solid form or precipitating the undesirable metals from the alkaline leachate to form a purified alkaline leachate, and adding the purified alkaline leachate to the body of water.

Abstract: A platform for sequestering carbon dioxide using a body of water is described. The platform has a vessel for holding solid metal hydroxide and for exposing the solid metal hydroxide to a flow of water to create a solution of a metal hydroxide having a pH level. The solution containing metal hydroxide is released into the body of water, causing a reaction with the carbon dioxide present in the body of water, thereby producing metal carbonate/bicarbonate, thus sequestering the carbon dioxide. A choice of the metal in the metal hydroxide, a rate of the releasing the solution containing the metal hydroxide into the body of water, and a flow rate of the flow of water so that to substantially maintain the solution containing the metal hydroxide at the pH level that is defined as environmentally safe and not changing chemistry of seawater. A corresponding method is also provided.

Abstract: The present invention describes ways of increasing the production efficiency of a saline water electrolysis cell and of consuming CO2 gas and sequestering it from the atmosphere. This is achieved by the introduction of CO2 gas into the catholyte of the electrolysis, where reaction of the CO2 with the hydroxide ions present in the catholyte reduces the pH of the catholyte, thereby increasing production efficiency of the electrolysis cell. The preceding reaction forms bicarbonate and/or carbonate, thus sequestering the reactant CO2 gas from the atmosphere. The CO2 gas may be introduced either directly into the cathode area of the electrolysis cell, or into the electrolyte prior to its introduction into the electrolysis cell. Corresponding apparatus is also provided.

Abstract: Method and system are disclosed for the production and use of a chemical compound, where a given amount of CO2 is emitted in the production and the use, including producing a second chemical compound that is required for the production or the use of the first compound, where the production of the second compound consumes CO2 and sequesters it from the atmosphere so that the total net CO2 emitted in the production and use of the first compound is now reduced. In one embodiment, the second chemical compound is a negative-CO2-emissions hydrogen, oxygen or chlorine gas produced in an electrolytic cell.