At a cost of millions of dollars, add iron dust to the ocean that fosters plankton proliferation which stinks to the ocean floor, hence absorbing vast quantities of CO2.
Wiki: This technique is controversial because there is limited understanding of its complete effects on the marine ecosystem, including side effects and possibly large deviations from expected behavior. Such effects potentially include release of nitrogen oxides, and disruption of the ocean's nutrient balance...Some environmentalists called the dumping a "blatant violation" of two international moratoria. Russ George [in this video] said that the [Haida First Nations] and its lawyers approved the effort and at least seven Canadian agencies were aware of it. According to George, the 2013 salmon runs increased from 50 million to 226 million fish. However, many experts contend that changes in fishery stocks since 2012 cannot necessarily be attributed to the 2012 iron fertilization; many factors contribute to predictive models, and most data from the experiment are considered to be of questionable scientific value. https://en.m.wikipedia.org/wiki/Iron_fertilization
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