Above is some good advise.

As I understand it, CO (Carbon Monoxide) is produced when fuels are burned with a poor supply of oxygen. Incomplete combustion. The sterno may indeed produce only CO2 and water when it is burning under ideal conditions, but here is what I would be careful about. If you burn the sterno in a vehicle where oxygen levels might become low, carbon monoxide may be produced because the sterno fuel is not burning completely.
Below is a list of sources that CAN produce CO.

Sources of carbon monoxide may include:
* boat motors
* cars
* charcoal grills
* cigarettes
* fireplaces (gas and wood) and wood-burning stoves
* gas ranges, ovens, dryers, water heaters, grills, furnaces and space heaters
* kerosene space heaters
* oil furnaces
* solid alcohol (such as Sterno Canned Heat)

smitty