I would be very surprised if this actually works. Ocean fertilization has been tried before and busted. Fundamentally, you are supplying the nutrients that ar

I would be very surprised if this actually works. Ocean fertilization has been tried before and busted. Fundamentally, you are supplying the nutrients that are limiting growth. You get a bunch of growth because of that. Most of what grows is eaten by other things up the food chain--atmospheric carbon dioxide becomes bound up in algae, fish and the like. When things die they mostly are eaten by something else. However, not every scrap is eaten--what isn't eaten falls into the ocean depths were bacteria get to it and produce methane. The end result is more fish to eat but basically no change to the greenhouse effect as methane is far more potent than carbon dioxide. Also, ocean fertilization only works to the extent that you can supply the missing nutrients. Dump too much fertilizer into the ocean and you get algal blooms that are bad for everything else in the ocean.