We may be able to increase the amount of carbon locked away in the ocean depths by making zooplankton produce faecal pellets that sink faster – and new research suggests we could do it by supplementing the tiny animals’ diets with clay. “They eat about anything and everything,” says Manasi Desai at Dartmouth College in New Hampshire.
Photosynthetic plankton in the ocean take up tens of billions of tonnes of CO2 from the atmosphere every year. But most of…