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Just to compare various sources:

* exhaled air is about 5% CO2

* auto exhaust is about 14% CO2

* airplane (turbofan) exhaust is about 2% CO2

* atmospheric CO2 is about .04% CO2

So, suppose that before putting the cap back on a 2 liter soda bottle that I have just used to dispense soda, I were put my lips around the spout, suck in, hold that position for as long as I can, and then blow out, and then put the cap back on. The idea is to try to fill that gap in the bottle with 5% exhaled CO2 instead of 0.04% atmospheric CO2.

Would this significantly delay the flattening of my soda?

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