IT IS another nail in the coffin of ocean fertilisation for cooling the planet. Early results from the latest field experiment suggest the technique will fail. “I think we are seeing the last gasps of ocean iron fertilisation as a carbon storage strategy,” says Ken Caldeira of the Carnegie Institution at Stanford University in California.
The controversial Indian-German LOHAFEX expedition fertilised 300 square kilometres of the Southern Atlantic with 6 tonnes of dissolved iron. Sure enough the iron triggered a bloom of phytoplankton. Dead bloom particles were then expected to sink to the ocean bed, dragging carbon along with them. …
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