Well, not really - it takes a lot longer to soak up c02 from the atmosphere than it does to burn it and put it back in. 10-20 years to grow a tree - 10 hours t

Well, not really - it takes a lot longer to soak up c02 from the atmosphere than it does to burn it and put it back in. 10-20 years to grow a tree - 10 hours to put it back. So yes, neutralised over a short-ish term timeframe. If you had even a small percentage of people driving cars like this, forests would disappear pretty fast. All biofuels have the 'zero co2' factor. I'd rather see electrics powered by hyrdo and nuclear, myself, if you consider c02 to be important. Because those two options have zero airborne emissions completely, and that's a far bigger factor in air quality than the amount of c02.