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This sounds much less efficient than the current proposed path of electrolyzing hydrogen? Direct air capture of carbon has, as I understand, extremely low effi

• eru 2y ago
  > This sounds much less efficient than the current proposed path of electrolyzing hydrogen? Addendum: it's hard to store hydrogen for a long time. That stuff is so volatile, and even 'seeps' through steel. What I sketched would work for seasonal 'storage'. But you are right, that it's very likely far from the optimal thing to do.
• eru 2y ago
  Yes, you could also make hydrogen when the sun is shining. (Or you could make methane.) Instead of doing direct carbon capture, you could also spend some energy to grind olivine rocks fine enough for something called 'enhanced weathering' to indirectly capture carbon.