Most reputable HVACR contractors spend a lot of time and energy training their technicians, as they realize the value of having a well-trained staff. 

Target and Amazon have both recently announced plans to construct new stores that contain CO2 refrigeration systems, which will help the retailers significantly reduce carbon emissions and energy use.

There is no question that the current environmental trend right now is electrification, which is part of an overall strategy to decarbonize our society. As with most everything in life, perhaps moderation would be a better way to approach electrification.