I've lost track of the literature since the early 1990's, but from what I recall of the early IRONEX experiments the problem was that net sequestration was disa

I've lost track of the literature since the early 1990's, but from what I recall of the early IRONEX experiments the problem was that net sequestration was disappointing: despite significant increases in fixation, much of this new carbon is remineralized by heterotrophs prior to burial. However, I don't know what some of the more recent data have shown—