Heya there.. you know who.. I'd like you to check this link out about c02.. I'm sure you'd like to experiment on the subject.. seems right up your alley..
http://www.rollitup.org/newbie-central/706-cheap-way-make-co2-your.html
http://www.rollitup.org/newbie-central/706-cheap-way-make-co2-your.html