There are several ways to de-acidify the oceans using today's technology. Here are some examples:

1. Ebb Carbon: This company uses technology and electrochemistry to speed up the ocean's processes of carbon removal, with the co-benefit of reducing ocean acidity.

2. Traditional clam farming techniques: Researchers have found that traditional clam farming techniques could offset the effects of ocean acidification.

3. Membrane-free electrochemical cells: Researchers at MIT have developed a reversible process consisting of membrane-free electrochemical cells. Reactive electrodes are used to release protons to the seawater fed to the cells, driving the release of the dissolved carbon dioxide from the water. The process is cyclic: It first acidifies the water to convert dissolved inorganic bicarbonates to molecular carbon dioxide, which is collected as a gas under vacuum. Then, the water is fed to a second set of cells with a reversed voltage, to recover the protons and turn the acidic water back to alkaline.

4. Heimdal: This startup pumps saltwater into a machine that uses electricity to rearrange molecules in the water, removing acid. It can then sell the acid it removes, which ends up in the form of hydrochloric acid. The de-acidified seawater can be returned to the ocean, where it will naturally capture CO2.

5. Direct ocean capture (DOC) technologies: This is a promising option for servicing a very large and diverse carbon removal industry needed to mitigate legacy carbon dioxide. Teams will focus on de-risking technologies that can capitalize on the unique benefits of ocean-based systems to help meet the promise of energy-efficient, low-cost, scalable CO2 capture.

6. Localized buffering: With consistent monitoring and early detection, localized buffering, site and breeding selectivity, and nutritional enhancements, the acidity of the ocean can be reduced.
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