Increasing ocean alkalinity to expand the carbon storage capacity of seawater
PREMISE
Ocean’s inner alkalinity naturally converts dissolved inorganic CO2in seawater into bicarbonates and carbonates. The resulting CO2deficit in seawaters is continuously rebalanced by the absorption of atmospheric CO2in the ocean. This process occurs naturally over geologic times.
AMBITION
Artificial addition of alkaline substances to seawater (for instance, the spread of large amounts of alkaline minerals such as olivine and basalt over the open ocean or beaches) may thus increase the capacity of the ocean to sequester atmospheric CO2, while reducing, at the same time, the acidification of the ocean.
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