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I note they term CO2 a long lived gas - how long does it last - e.g. if I breathe out now when does the CO2 content get removed, and where does it go ?
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I'm not sure about the long-lived part part; maybe that's compared to Helium which will exit to Inner Space, or complex gases like methane that will disassemble in sunlight.
When you breath out the CO2 is added to a pool that is drawn from when plants are in sunlight and *growing*. Mike Cheikey addresses this in that
Solve For X talk.