Jolly Rancher on Nostr: Since that time, I think oceanographers have done a few little test patches in the ...

Since that time, I think oceanographers have done a few little test patches in the southern oceans. Of course one projected outcome was eutrophication, turning clear blue water into green slime.
But the result was this: iron just ends up on the bottom. It benefits a few algae for a short time, becomes benthic 'snow' (as hoped for), but without sequestering much carbon as the iron does not redissolve. Fe+++ is soluble in acidic, but insoluble in basic media.