A piece on this evening TV news. A shortage of CO2 in the UK, so pubs are concerned, what w/ the World Cup and all. Huh??? I always thought the CO2 in hi Q beer was 100% natural. 100%! Created naturally during fermentation. As w/ good Q champagne. Or is it injected into the kegs, at the pub, just to power the keg's beer to the tap?
And yes, I don't drink much, and have never bought/worked a party keg.
Your confusing fermentation with the CO2 shortage.
The CO2 is used in the pump system to get the beer from Keg to Tap and then into the glass. Without the CO2 the pumps for the beer the beer and other soft drink dispensers won’t work.
Some traditional beers still use a hand pump and so will not be effected but that’s a very very small minority
How beer pumps work
A beer tap works by using air pressure to force the beer out of the keg, through the tube and into the glass, and the air pressure can either come from CO2 tanks or a manual pump.