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).
But the change in carbon chemistry of the
ocean and ultimately the atmosphere need to be transparently documented,
also, if we are to trade carbon offsets based on
iron fertilization.