What happens when you "seed" a 300 sq km patch of ocean with iron dust?
If you're a scientist you hope it will spur on algae growth and absorb vast quantities of CO2...at least that's what you hope.
Researchers in the southern ocean did just that this month and, as hoped, algae did bloom, but it was quickly digested by non CO2 absorbing Copepods and other marine life that eat algae. BBC News has some great coverage.
Now if we could only get rid of the damn Copepods with the addition of genetically modified fish?