@ckeen Radio Ecoshock occasionally interviews people working on capture and sequestration. There's a somewhat promising tech in Iceland called CarbFix (and CarbFix2) that was reviewed a couple years back.
https://www.ecoshock.org/2016/06/science-of-extreme-climate.html
Ecoshock is pretty dire, but the creator orders each episode from worst to best news, and sometimes the best news is about sequestration. But recently a study was highlighted that suggested the most effective re-capture tech is probably replanting forests.