Do you really think that adding iron releases net carbon? That would be hard to explain chemically.

The worst case scenario laid out in that article is that most of the carbon absorbed, was later rereleased. So net zero carbon, not net carbon emitter.

I've seen other reports of that exact experiment that estimated a significant net carbon sink. The actual experiment failed to make measurements that lets us know which actually happened.

Regardless, we've certainly demonstrated that, at least sometimes, there is significant net carbon capture, at low cost. Given the certainty of global damage at present, I believe that this justifies continued experimentation. Even if it means accepting possible risk to local ecosystems. The local ecosystem can generally recover. The planet, not so much.

You think the chemical compounds were just magiced into the ocean with no carbon intensity. It literally says carbon will not be absorbed and that geoengineering is not the goal.