The Southern Ocean may be Earth's safest place to remove carbon, scientists find
A new study published in Nature suggests that the Southern Ocean is the most effective and safest location for ocean iron fertilization to remove atmospheric carbon. Researchers found that while this method can sequester carbon, it carries significant ecological risks that vary by region.
Why it matters
Identifying safe methods for large-scale carbon removal is critical for climate change mitigation, but the study highlights the need to balance carbon goals with marine ecosystem preservation.
As the world searches for ways to remove carbon dioxide already accumulating in the atmosphere, ocean iron fertilisation (OIF) has emerged as one of the most debated climate intervention strategies. The idea is deceptively simple: adding tiny amounts of iron to iron-poor parts of the ocean stimulates the growth of phytoplankton, microscopic marine organisms that absorb carbon dioxide during photosynthesis. If some of this organic carbon sinks into the deep ocean, it can remain stored for years or even decades. However, scientists have long questioned whether the climate benefits outweigh the ecological risks. A new Nature study finds that the answer depends largely on where fertilisation takes place.
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