Quote:
Originally Posted by KevanGuy
Could we harvest enough CO2 from the atmosphere to run an ethanol engine in a car as it drives?
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Unfortunately no, as BBS mentioned to harvest CO2 in a car you'd need a source of electricity to do it, so you'd need a battery, which would all be horribly inefficient. Better to just use the battery directly.
Either the ethanol is a method of energy storage and transfer (i.e. a nuclear plant generates electricity, which is used to draw the CO2 and create ethanol which can then be used to power cars and stuff), or a method of sequestering CO2 permanently (same as above, except put the ethanol into the earth never to be seen again).