We /can/ do better than those refrigerants, though. R-1234yf has a tiny global warming potential compared to even some of the green choices out there like prop

We /can/ do better than those refrigerants, though. R-1234yf has a tiny global warming potential compared to even some of the green choices out there like propane or isobutane. There's also the old solutions like CO2, or even ammonia (though that I wouldn't expect anywhere but industrial environments).