This suffers from the same objections as all carbon sequestration "solutions" - why would anyone dump expensive fertilizer into the ocean? How would they haul it there without burning more fuel? How would they make the fertilizer?
Carbon sequestration is energy negative. The global population of Earth is hurling boulders off a cliff - hoping that a madman Sisyphus decides to lug them back up (to be hurled down again) is not a solution to anything.
Carbon sequestration is energy negative. The global population of Earth is hurling boulders off a cliff - hoping that a madman Sisyphus decides to lug them back up (to be hurled down again) is not a solution to anything.