Remember the rogue scientists who sprinkled iron in the Pacific Ocean off Canada? Did it work?
Andy Revkin reviews the evidence and comments on the significance of the results. The iron made a plankton bloom, but the experiment was too small to be significant beyond that. No big impact on CO2 or salmon.
One thing's for sure, this subject isn't going away. Ocean engineering and climate engineering will become increasingly topical and controversial if we fail to fix our CO2 problem by switching to clean energy.
By the way, I'm reading an interesting new book on rogue ocean scientists, it's a fascinating subject. More later...