There's a page linked from the above link: http://planetsave.com/2011/01/26/iron-seeding-of-ocean-may-promote-toxic-plankton/ http://planetsave.com/2011/01/26/

There's a page linked from the above link: http://planetsave.com/2011/01/26/iron-seeding-of-ocean-may-promote-toxic-plankton/ http://planetsave.com/2011/01/26/iron-seeding-of-ocean-may-p... Which says "...while iron seeding does indeed promote algal blooms, not all alga are equal — some forms can be poisonous to other lifeforms. One such form of plankton — a species of diatom by the name of Pseudo-nitzschia — happens also to be strongly associated with a wide-ranging neurotoxin called domoic acid (DA). The toxin may be a metabolic by-product or perhaps an adaptation (survival strategy) of this planktonic life form." "Given the proposed use of iron fertilization strategies to reduce atmospheric CO2 and ocean acidification, the authors caution: “…consideration of the potentially serious ecosystem impacts associated with DA is prudent."