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CO2 cartridges can be recycled. Just take them to the same location that recycles scrap metal. Our everyday purchases have a lot more "scrap" material built into the packages than co2 cartridges. At least the ones I buy don't even come in packages - just individual cartridges at the LBS. And I've only used one in the last year.
As we must account for every idle word, so must we account for every idle silence." ~Benjamin Franklin