Way off topic, but I see this mistake quite often.
CO is carbon monoxide, the deadly gas. CO2 is carbon dioxide. Very different gases with different properties. CO2 isn't poisonous, it forms a small part of the air we breathe. It's heavier than air, but not poisonous unless in the absence of air, which is why it can suffocate fires and is used in fire extinguishers. Carbon monoxide in such concentrations is flammable, it wants to add the second oxygen atom to make CO2.
Carbon Monoxide is poisonous, but not heavier than air, so can fill a car cabin or tent quite easily. It's given off by combustion, particularly barbecues (charcoal) and gas stoves (carbon based fuels). If, by this stage of my post, you are starting to doze off, open the window, it's the CO getting to you
A Jetboil in a car with the windows open is no problem, and there's no way in the world I'd take a portable battery microwave anywhere, I don't even use the one at home.