The MSR Reactor actually went through a recall because of a test Backpacking Light did that revealed very dangerous levels of CO2 it was giving off... they fixed the problem in newer stoves. People frequently ignore "do not use in a tent" warnings. The original Pocket Rocket gave off enough CO2 to cause a headache.

I'm pretty sure outdoor use disperses what little is there... but, I'm still pretty happy the Giga is rated one of the lowest CO2 makers on the list.

_________________________
"In the beginner's mind there are many possibilities. In the expert's mind there are few." Shunryu Suzuki

http://hikeandbackpack.com