Using energy to mine coal, burning it releasing co2, using energy to convert the co2 back to coal, and using energy to bury it. Thats a loop with a giant net energy loss.
I'm not knocking the researchers for this, it's important to research stuff that isn't practical yet.
But talking about sequestration without talking about a hard stop to fossil fuel production is nonsensical. If you want to sequester one ton of carbon you get a bigger net benefit by extracting one ton less.
It's cool that we can make coal from air. I'm glad somebody is researching it.
Burning a ton of coal to make electricity to concentrate coal combustion products and electrify a catalyst to make a fraction of a ton of coal so you can bury it is so obviously stupid I'm kinda mad the article talks about sequestration without mentioning it.