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" ... The basic idea is pretty simple. There are large areas of the oceans that simply don't support much life. Almost all of the necessary nutrients are there except for iron (and other areas also lack silicic acid). What this means is that when we add iron to such waters we get a plankton bloom. No, not quite the same thing as an algal bloom, or dead zone, that we see from excess farm fertiliser runoff. Rather, the plankton bloom becomes the feedstock for fish: more lovely seafood for us to enjoy. And that plankton that doesn't get eaten dies off, falls to the seabed and eventually becomes rock. So, we lock away carbon dioxide for that's the very thing that those plankton are using to grow with the iron we're providing as a catalyst. Note that this happens quite naturally at times: high winds above the Sahara will sweep iron rich sand and dust out to sea and we get those blooms, certain volcanic eruptions do the same. We know very well that this happens. ... "