I would like to add to this conversation about the use of CO2, a recognized greenhouse gas which is increasing in concentration in the Earth's atmosphere.
The use of CO2 would seem reflexively to be bad, as global efforts are needed to decrease CO2. However, most industrial bottled CO2 is captured from natural gas extraction as a waste product. This CO2 would end up in the atmosphere with industrial use or simply left ignored.
As long as we produce and use natural gas, we will have CO2. Avoiding using CO2 for painting freight cars won't make a difference in the climate.
