Vesta, Ebb Carbon, Planetary Technologies, Heimdal (YC), some stealth companies, and some academics are looking at OAE directly. (may be missing a few) There

Vesta, Ebb Carbon, Planetary Technologies, Heimdal (YC), some stealth companies, and some academics are looking at OAE directly. (may be missing a few) There are a lot of terrestrial enhanced weathering folks too, where the alkalinity eventually washes into the ocean after being spread on land.