re: I don't understand
I read years ago that the companies (Dow?) that made CFC's were the funders of the studies that showed they were so dangerous. That sounds strange until you realise the money they would have made by replacing all that gas, making money out of disposal and selling a more expensive replacement. It's an old story and I would like to read it again, but there is one good thing about it. Since it was a big company it's probably all the Republican's fault yet again. Make lots of money and get the ecologists to do the work for you, nice scam. There may be more to it though.