As previous posters have pointed out Greenhouse is a hoax, and global cooling is more to be feared than global warming.
The CFC issue relates to Ozone depletion not greenhouse. It is difficult to say how much CFC use contributed to Ozone depletion but it might be significant and cutting back on CFC use is probably wise. Nothing to do with temperature though.
Another fallacy is that the forests recycle most of the oxygen. They don't, the micro-organisms in the oceans do most of that. The oceans are the lungs of the world, not the forests.
