> Keith and his team showed they could capture CO2 directly from the air with
> less than 100 kilowatt-hours of electricity per tonne of carbon dioxide.
As alluded to in the article, it's well known that the energy
requirements for CO2 capture from air are low. It still needs to be
stored though, and that means reacting it with minerals or pumping it
underground. So, that 10:1 ratio they give is a bit of a red herring.
Ethanol and fertiliser plants yield CO2 as a pure stream at 0 kWh
energy cost. It's a by-product that gets produced as an intrinsic part
of the process (it's about a kg of CO2 per kg of ethanol). And even
so, very little of it is then permanently stored, mostly it gets added
to fizzy drinks or just vented.
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