Possibly important in future: https://www.nature.com/articles/s41467-019-08824-8 … CO₂ --> solid C on room-temp liquid gallium-tin-indium-cerium alloy. Looks scalable, except for huge energy cost. If that cost could be cut, could lead to sequestration of atmospheric CO₂ -- a super-big deal.
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In the past, chemists have repeatedly come up with tricks to get around the apparently intractable energy requirements of endothermic reactions. Sometimes they can't, to be sure. But it seems foolish to rule out the possibility of success.
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Invoke the nuclear option.
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