Once you know what plankton can do, you’ll understand why fertilising the ocean with iron is not such a crazy idea

David Biello in Aeon:

Call me Victor,’ says the mustachioed scientist as he picks me up from the airport on a brisk, fall afternoon in Germany. Victor Smetacek is an esteemed marine biologist, but he’s decided to spend his golden years on an ambitious new pursuit. He has devised a plan to alter the mix of gases in Earth’s atmosphere, in order to ward off climate change. He is, in other words, an aspiring geoengineer.

I came to the ancient city of Bremen to ask Smetacek about an extraordinary experiment he performed more than half the world away, in a forbidding sea seldom visited by humans. This sea surrounds the vast, white continent of Antarctica with a chilly current, locking it in a deep freeze. This encircling moat reaches from the surface waters to the ocean bottom, spanning thousands of kilometres. It is known as the Southern Ocean and it is famously dangerous on account of icebergs that hide in the gloom that hovers above its surface. The churn of its swells sometimes serves up freak waves that tower so high they can flip ships over in a single go. It is in this violent, lashing place that Smetacek hopes to transform Earth’s atmosphere.

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