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Setback for climate technical fix

The biggest ever investigation into putting iron filings in the ocean as a climate change fix has brought modest results.The idea is that the iron would stimulate growth of algae, which would absorb CO2 from the air. But scientists on the Lohafex project, which put six tonnes of iron into the Southern Ocean, said little extra carbon dioxide was taken up, because the algae were being eaten by tiny creatures called copepods.
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