I'm not sure if it's more efficient than the methods you mentioned, but Project Vesta makes some pretty bold claims using the carbonate-silicate cycle. More det

I'm not sure if it's more efficient than the methods you mentioned, but Project Vesta makes some pretty bold claims using the carbonate-silicate cycle. More details: https://news.ycombinator.com/item?id=20403570 https://news.ycombinator.com/item?id=20403570 https://www.vesta.earth/ https://www.vesta.earth/