Ocean Carbon Sequestration Could Affect Ecosystems, Study Finds

An international investigation has looked at methods to reduce emissions and warned that some marine interventions would exacerbate deep-sea oxygen loss

In the race to curb global warming, the oceans appear as a key ally. Various scientific projects highlight the sea’s ability to absorb carbon dioxide (CO₂), something that would help mitigate the impact of greenhouse gases. However, new research warns that some of these strategies could have serious side effects for marine life. Published in the journal Environemental Research Letters. the study was led by Andreas Oschlies, a researcher at the GEOMAR Helmholtz Center for Ocean Research in Kiel, Germany, together with an international team of experts. According to their findings, many ocean carbon removal techniques – known as mCDRs – can intensify the loss of oxygen in the water, a phenomenon already accentuated by climate change.

“The ocean has lost about 2% of its oxygen in recent decades, and any further warming will lead to further losses,” Oschlies explained. “What benefits the climate is not necessarily good for the ocean,” he added.

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