Can the Ocean Become Earth's Next Climate Weapon?
The world's oceans cover over 70% of the planet and play a crucial role in regulating carbon dioxide levels. They currently hold more than 50 times the amount of CO₂ found in the atmosphere. Now, a new project is testing whether humans can boost this natural process to fight climate change.
The LOC-NESS Project, the first U.S. open-ocean trial of ocean alkalinity enhancement (OAE), is underway. Early findings suggest this method could help the ocean absorb even more carbon from the air. Oceans already absorb around 25-30% of human-caused CO₂ emissions each year. Their vast carbon reservoir—15 to 20 times larger than all land plants and soils combined—makes them a powerful but underused tool in climate action. Yet, even with deep emissions cuts, scientists warn that reductions alone may not keep global warming below 1.5°C.
OAE works by altering seawater chemistry to speed up the conversion of dissolved CO₂ into stable carbonate and bicarbonate forms. Preliminary results from LOC-NESS show that small-scale OAE can create conditions where the surface ocean actively pulls more carbon from the atmosphere. However, researchers stress that more work is needed to assess long-term effects, especially on fisheries and marine ecosystems.
Experts also agree that no ocean-based carbon removal method can be scaled up responsibly without strict monitoring. A clear framework for tracking and verifying stored carbon is essential before wider deployment. The LOC-NESS Project marks a step toward understanding OAE's potential. If proven safe and effective, it could become part of broader efforts to reduce atmospheric CO₂. But further research and careful oversight will determine whether this approach can play a lasting role in climate solutions.
