I was curious about the lack of mention of Carbon Monoxide in the Sterno MSDS, so I emailed them. here is the exchange:

"I am trying to determine whether or not Sterno puts out any appreciable amount of Carbon Monoxide (CO) while burning. I am putting some into my 72 hour kits. I understand adequate ventilation is necessary, but I specifically need to know about carbon monoxide emissions. Thanks, Vince"

Thank you for your inquiry. Sterno produces only CO2 (Carbon Dioxide) and H2O (Water) as a result of burning. It was designed to be safe indoors. As it is a fire-producing product, however, we would advise that children and pets be kept away to prevent accidental burns.
The Sterno Brand Team "

Regards, Vince