for what it's worth, one of the things that is influencing my next stove purchase is CO2 output. because I'm going to be doing some winter camping, which means cooking in my vestibule, i want to be sure I don't poison myself. backpackinglight.com had a very good, thorough, and scientific write-up on a bunch of different stoves and their CO2 output. because of that article, I'm going with a Snow Peak GS100