Proposals have been made to fertilise large areas of the ocean with iron to increase phytoplankton growth and so increase the ocean’s capacity to draw carbon dioxide (CO2) out of the atmosphere. Several commercial organisations are actively promoting ocean iron fertilisation as a climate mitigation strategy and a means to gain carbon accreditation.
Controlled iron fertilisation experiments have shown an increase in phytoplankton growth and temporary increase in drawdown of atmospheric CO2.
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