The CO2 is injected into porous basalt, which is covered by a deep impermeable cap of sediment on the ocean floor, where it dissolves in water.
There is enough sub-ocean basalt worldwide to potentially sequester 250,000 gigatons of CO2, said Tutolo.
Scalable carbon capture and storage projects, such as Solid Carbon, are urgently needed to meet mid-century net-zero climate targets that can’t be met by reducing emissions alone, Moran said.
“It’s not pie in the sky,” she said.