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Donna Lu is an assistant editor, climate, environment and science at Guardian Australia
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The barges, which measure between 20 and 32 metres long (66 to 105ft), had to be cleaned and made seaworthy before they could be towed into place and set on to a platform of sediment.
Quantitatively, what she describes as these "everyday attentive acts" turned out to be much more powerful than grand romantic gestures.