I very rarely see anyone talking about iron fertilization [1]. The oceanographer John Martin said "give me a half tanker of iron, and I will give you an ice age" [2]. Why are scientists not looking into this? Wikipedia states that the last experiments were done in 2012. It's been five years, and besides the precautionary principle (which in the case of the global warming should work in reverse), I don't really see any reasons to not perform further experiments.

[1] https://en.wikipedia.org/wiki/Iron_fertilization#Precautiona... [2] https://en.wikipedia.org/wiki/John_Martin_(oceanographer)