Well, the CO2 plan is right out. Sure, you don't dump a load of carbon into the air, but burning ethanol produces aldehydes (quite a lot of them) and breathing aldehydes is like really, tremendously bad for you. Inhaling much less than one part per million of formaldehyde is going to make you want to lie down.
Boru
Boru
‘I can’t be having with this.’ - Esmeralda Weatherwax