Other projects apply energy to turn the CO2 into liquid fuel. Of course that returns the CO2 to the atmosphere, but it'll be a long time before we electrify long-haul jets so it'd be great if their fuel were carbon-neutral.
Thanks for this comment - the calculations I'd been doing in the GP comment and elsewhere where pretty darn depressing and this approach you're mentioning is very exciting in that it bypasses the fundamental storage volume problems most other sequestration methods face by leveraging the interstitial spaces inside existing rock volumes, and also exciting in that it leverages undersea rock formations for even lower impact. Thanks for pointing me to this.
For others interested in learning more you might hit [0] or [1].
[0]https://news.climate.columbia.edu/2020/02/19/solid-carbon-ma...
https://www.osti.gov/servlets/purl/1390435 <-- a non-commercial study on this topic.
https://youtu.be/osXq-k84LpA?t=2177 <-- a webinar that addresses this topic