Nitrogen: 78 percent
Oxygen: 21 percent
Argon: .9 percent
CO2: a measly 0.04 percent
Groking that last value really helps frame the challenges that CCS has to deal with (and also gives one an appreciation of just how powerful of a greenhouse gas CO2 is).
So, while that is not an absolutely example (as lots of stuff in the store is still owned by the separate vending companies), it is a good caveat to our first "grocery stores do it" thought that comes to mind when thinking about this Amazon topic.