(sorry, catching up with the science here)

On the acidification front, I suppose their hope is they'll get results like:
Iron --> Plankton pulling CO2 from ocean (ocean less acidic) --> Dead Plankton settling on the ocean bottom --> Sequestered carbon

The main argument against this might be that the plankton will pull CO2 from the air, then dissolve it back into the water as the plankton decomposes - ending up with more CO2 and less O2 deep at the bottom.  If they were proposing a slow and gradual iron increase, I might be on their side - as long as O2 levels were monitored in the deep ocean.  But a sudden dumping?  If they're wrong, it sounds like they could mess up the local deep sea ecology for years.

Actually, it might be a service to the world, if one could reduce the feckless and boring Johnny Depp to a microscopic state.

On nano-stuff:

Specifically, this experimental dumping of nano-iron into the Ocean, behind which no doubt lies huge amounts of scientific wisdom, is intellectually analogous to the release of non-native species into new environments, in order to put right some defect -- e.g. starlings, mongooses and cane toads.  This subject came up in a recent post by Erik Hoffner.  It remains unclear whether any intentional release of a non-native species has worked well.

More generally, I happen to belong to the class of people who get the creeps whenever we hear a word prefixed with "nano."  So, I ask two questions: first, are there a lot of other people like me in this regard?; and second, are the people who put great hopes in nano-technology truly sound and reasonable and trustworthy?

By the way, within the Tyrannosauridae, the granola paleontologist Robert Bakker erected a number of years ago (1988) a new genus and species, Nanotyrannus lancensis, on the basis of a diminutive skeleton with tyrannosaur affinities, which earlier had been considered a baby Albertosaurus.

Cute.  One wonders if it would have made a good pet.  Even so, I doubt Little Dog would like having one around.

Chickens are our cousins! So are other sensitive animals! Enough is enough! No more factory farms!

>>  which would not speak well for their integrity

Planktos is the only ethical organisation with a worthwhile solution, and yet as per usual, the rest of the world puts them down.

I understand !, Y'all really want this world to end.

Well so be it... I am not of this place.

>>  catching up with the science here)

don't bother there isn't any, and any suppositions made will be entirely off the truth, dangerously so.

This the kind of optimistic can-do crap they used to do in the former Soviet Union; when something caused an environmental mess, instead of backing off, they just came up with another brilliant solution to fix that problem; which caused its own environmental mess, which required its own brilliant solution; etc., continue until you have the environmental disaster known as the former Soviet Union.

See also: "The surge will succeed in Iraq".