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Volume 656 Issue 8126, 6 August 2026

Bloom service

A number of strategies have been put forward to help mitigate the rising levels of atmospheric carbon and so help combat climate change. One possibility is fertilizing the oceans with iron to stimulate the growth of marine algae, which can sequester carbon through photosynthesis, locking it away when the algae die and are carried into deeper waters. This strategy can have serious ecological side effects, such as rampant algal blooms, oxygen depletion and nutrient depletion in adjacent regions, although the extent of these issues, and any beneficial trade-offs are poorly understood. In this week’s issue, Jun Yu, Keith Moore, Adam Martiny and colleagues simulate the effects of 60 years of iron fertilization across ten ocean regions using an advanced model. The researchers affirm that the approach can result in carbon export, and they identify the Pacific and Southern Oceans as the most efficient areas for removal. But they also see that in the equatorial Pacific, local blooms have a potentially disruptive effect on nutrient availability elsewhere, lowering zooplankton biomass in remote regions, whereas in the Southern Ocean adverse ecological effects are lower. As a result, the authors suggest that fertilizing the Southern Ocean could offer the best balance between ecological disturbance and CO2 sequestration, although there still might be broader global impacts, including carbon re-emission, over centennial timescales.

Cover image: NASA/SPL.

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