Iron has been shown to stimulate productivity in certain areas of the modern ocean. However, it was not the primary driver of carbon burial in the equatorial Pacific Ocean for the past 10 million years.
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Lyle, M. Bloom without fertilizer. Nature Geosci 1, 576–578 (2008). https://doi.org/10.1038/ngeo287
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DOI: https://doi.org/10.1038/ngeo287