The idea of dumping iron into the ocean to sequester carbon was brought to light mostly by the company Planktos. The premise is that iron has proven to be a limiting nutrient for marine algae. Photosynthetic algae in the ocean contribute largely to the sequestration of atmospheric carbon. By dumping iron into the ocean, usually in the form of iron dust, carbon is theoretically being removed from the atmosphere and being sequestered into the growing algal populations. There are a lot of problems associated with this idea, which is why the EPA officially made it illegal without a permit to dump iron into the ocean. This could also contribute to ocean acidification which is bleaching coral reefs. There are also a lot of questions as to how much atmospheric carbon increasing algal blooms actually sequesters any. There are also a number of unanswered questions as to how these algal blooms would affect ecosystems and other species in the area.
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