Whaling left oceans with less of the animals’ faeces, which drives algal blooms that lock away carbon. Now scientists are trying to mimic this process with artificial substitutes.
The experiment is the first in a wider effort by David King, former chief scientific adviser to the UK government, and a coalition of six universities and research centres to test the potential for an approach they have dubbed marine biomass regeneration.that can feed billions of fish.
Precisely what the artificial whale faeces will be made of is yet to be decided, but iron-rich sand or volcanic ash are two options being considered. Key will be ensuring it offers the right mix of nitrates, silicates, phosphates and iron, says King. The material will be loaded onto baked rice husks – a factory waste product – which will act as rafts to carry the material on the sea surface.
The timing of the experiment will depend on the weather, but it will mark an important first step for King,
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