I haven't looked at these issues for awhile, but isn't refrigerant phase-out based directly on the Montreal protocol - because it addresses ozone depletion? The Montreal protocol originally set the phase-out milestones for CFC (R-12) and HCFC (R-123, R-22) refrigerants, among others. The US's 1990 Clean Air Act put many of those recommendations and a variation on the phaseout schedule into law.
The Kyoto protocol addresses global warming, which is only tangentially related to refrigerants through equipment efficiencies (despite Trane's disingenuous marketing regarding R-123 vs. R-134a).