The resulting photosynthetic activity could, in theory, increase the storage of carbon from the atmosphere into the deep ocean.

UNESCO: MEDIA SERVICES

The other approach is less risky, and involves removing carbon directly from the atmosphere and burying it in vast ocean storage beds or deep inside the earth.

NEWYORKER: The Climate Fixers

He added that there was a need to for "carbon capture in storage for gas-fired power stations" to ensure that the carbon is not released into the atmosphere.

BBC: UK