the stuff currently used in car AC is R134a, a hydrofluorocarbon (HFC). It's used in the Roadster, too. European union regulations decreed to avoid R134a in all new cars sold within EU, beginning with 2011. R134a is to be replaced with something "better for the climate" - R1234yf which is still a HFC. R744 (plain CO2) was in discussion but the car industry dropped it for cost reasons. Economics of scale make it reasonable to me that all ICE cars will go with R1234yf in the long term.
Please TESLA I want my Model S without CFC, HFC, or similar stuff inside the AC. Go for R744. Since all ICE assisted subsystems have to be redesigned in an EV, there is a real chance to make a switch to environment friendly AC at little additional cost, if any.
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