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.
Therefore we, who are the protectors of the human race, are agreed, as we view the situation, that decisive legislation is necessary, so that the long-hoped-for solutions which mankind itself could not provide may, by the remedies provided by our foresight, be vouchsafed for the general betterment of all.
It sounds like arrogance and condescension.
I tell them to turn to the study of mathematics, for it is only there that they might escape the lusts of the flesh. -- Thomas Mann, "The Magic Mountain"