Looks like the greenies are out to screw with us again. It wasn't that long ago that they legislated Freon out of existence because it was said to contribute to the deterioration of the ozone layer. It was replaced with R134a, which is benign to the ozone layer. Great, right? Nope. According to the New York Times, it may be on the way out because "its potential for high contributions to the global greenhouse effect." Can't these morons make up their minds? Now there is a bunch of bickering over what will be replacing R134a. One option (believe it or not) is Carbon Dioxide—you know, that thing that causes global warming. This is favored in Europe, but will mean re-engineering every A/C system currently in use. The US favors R152a, which is a direct replacement for R134a, but is highly flammable.