Wiki says R410a is does have a high GWP. But at what quantities are we talking about? I think with global warming we're sometimes barking up the wrong tree. Rather than focusing on energy conservation and looking at net lifecycle energy use, as well as looking at controlling certain natural sources of GHG's, we go after "easy targets".
You want rational solutions to cut CO2 emissions. Lets try reducing the global human population which will then reduce both methane and CO2 emmissions from livestock and humans.
In my opinons, naturla soruces of Co2 outweigh human produced soruces to such a degree that they are nearly insignificant. We human like to think we cna control the planet, but in reality, we're still just along for the ride. The eco system is far, far more adapatable than we give it credit for.
Normal climate shift cannot be rules out as a cause for flucuating global temperatures. We simply have too little data over to small of a time peridod to prove otherwise. There are too many vairables in the equation that we cannot predict.
There's also far to much money involved on both sides of the argument to trust any of the conclusions that have been drawn.