Will long-term refrigerants end up on endangered list?

Hydrofluorocarbon refrigerants, the alternative to ozone-depleting chlorofluorocarbons, may be restricted by subsequent environmental regulations for their global warming potential (GWP). James Wolf, American Standard VP for government affairs, told members of the Mechanical Service Contractors of America, that HFC 32, 134a and 125 have GWPs beyond that which federal regulators may later permit. HFC-152a has low GWP but is highly flammable. If the industry can show that it can properly contain these chemicals, permissible levels of GWP may not have to be so strict.
FORT LAUDERDALE, Fla. -- For many in the hvacr industry, the 'solution' in long-term refrigerants is here with such recently familiar HFCs as 134a set to replace CFC-12, and HCFC-123 [...]