(
Iron fertilization enthusiasts focus on the Southern Ocean because other seas have much more natural algae, so growing blooms might
just foster growth that would have happened anyway.)
The Planet Remade covers all the main proposed geoengineering techniques --(not
just SAI, but also ocean
iron fertilization (OIF), marine cloud brightening (MCB), bioenergy with carbon capture and storage (BECCS) and direct air capture (DAC)-RRB-, outlining their history, the current state of knowledge, and expected risks and benefits (and impressively, without descending into the alphabet soup of all these acronyms).