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A comment on How much does air pollution cost the U.S.?. Parent comment

Re:How much does air pollution cost the U.S.? by zaroth on Wednesday October 09, 2019 @12:23AM (#21200004)
This is a great question. I had exactly the same thought some time ago and was scratching my head where the extra mass was coming from.

Short answer, it pulls oxygen from the air to make the CO2. Most of the mass of CO2 is from the O2 that came from the air, not the tank.

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