There really is very, very little carbon in the atmosphere, famously ~410 ppm. (Yes, that little bit is enough to absorb significantly more heat from the sun).
So, whatever capture system you use, you'd need to move a lot of air through in order to produce a small amount of something like liquid hydrocarbon fuel.
It will require thousands of times more air, by mass. Since the output fuel product is hundreds of times more dense, it would require a crazy large volume of air to extract the carbon necessary to fill a fuel tank.
A corn field combined with a methanol fermentation and distillation facility is an example of a machine that does that. Very large.
So, whatever capture system you use, you'd need to move a lot of air through in order to produce a small amount of something like liquid hydrocarbon fuel.
It will require thousands of times more air, by mass. Since the output fuel product is hundreds of times more dense, it would require a crazy large volume of air to extract the carbon necessary to fill a fuel tank.
A corn field combined with a methanol fermentation and distillation facility is an example of a machine that does that. Very large.