Three scientist studied a system that has been running for billions of years, and is probably the most complicated and chaotic system we can imagine. They concluded that man was responsible for what was happening.
To be fair there is good scientific evidence the CFC's damage the Ozone layer. When CFC's breakdown they produce chlorine (this is scientifically provable in a lab) chlorine depletes Ozone, again provable.

So whether or not CFC's can on there own be proved to have caused the whole in the Ozone layer (not the separate seasonal one over the south pole) there is proof that they can and do cause damage to the Ozone layer.

For that reason alone they should and are banned and a lot brighter people then you or me think so too.

I have to say i have noticed that you are often very sceptical of scientific research that goes against your own belief system. You don't believe that global warming is man made and this seems to colour your judgement on the issue.

Rather then making uninformed statements on the subject and pouring scorn on scientists that have no agenda but to further our understanding of the world and they way we interact with it, maybe you should actually read a little more on the subject and not jump on statement like the above that if you read it doesn't even back up what your saying.

And this idea you have of just because some thing are very large or happen over a long period of time we are unable to understand them or test them is just plain wrong.

Oh and Science is a constantly evolving thing, as we continue to test our hypothesis, so our understanding of what is going on changes, this is how Science works !!!