Although it is important to control emissions of CO2 to mitigate global warming, atmospheric levels of the gas are also related to how quickly it is removed from the air by the means of land and ocean storage. The micronutrient iron is crucial for oceanic carbon storage because it can support the production of chemical energy in marine ecosystems by photosynthesis (known as iron fertilization). This process converts CO2 into O2 and organic compounds.
Click here for original story, Human-made iron inputs to the Southern Ocean ten times higher than previously estimated
Source: Phys.org