> Or about 2 billion liters of air for 1 tonne of CO2. I'd appreciate an attempt to actually put some numbers on how much it would cost to pull in a billion bi

> Or about 2 billion liters of air for 1 tonne of CO2. I'd appreciate an attempt to actually put some numbers on how much it would cost to pull in a billion billion litres of air, because on the face of it this sounds like it might only cost a trillion dollars in equipment, not counting the giant solar farm required to run it.