I think the implication is that global warming would heat up the oceans so you don’t need to put more energy in. However I don’t think warming the ocean is nec

I think the implication is that global warming would heat up the oceans so you don’t need to put more energy in. However I don’t think warming the ocean is necessary for iron fertilisation to promote plankton growth and thereby remove CO2 from the atmosphere. https://en.m.wikipedia.org/wiki/Iron_fertilization https://en.m.wikipedia.org/wiki/Iron_fertilization