I'd like to make a prediction: This plan will not be tried.
This is because the premises of environmentalism are:
The second premise leads to the conclusion, that all human manipulations of reality is evil. And adding iron sulphate to the oceans is very manipulative. The only plans against global warming that will tried are those plans which limit human manipulation of world to suit his existence and happiness. All kinds of restrictions and obligations which limit human well being will be implemented. And we will be asked to accept the sacrifices for the ideal: i.e. a world were we do not exist. A more anti-human philosophy cannot be imagined.
Scientists will study your brain to learn more about your distant cousin, Man.