I disagree. This isn't generally how science works. You would have to make an argument as to why you would expect a planet with a crust of chlorine and flourine and the specific mechanism that works in a self-consistent chemical framework to continuously produce CFC's at a level that they could build up against photolysis in a planetary atmosphere. You cant get six orders of magnitude increase in flux for free just by saying "anything could happen" It's just not a very convincing argument. It is absolutly unequivocal that the CFC's in our atmosphere are anthropogenically produced. If our project is funded, we will calculate the fluxes necessary to sustatin ever larger quantities in various atmopsheric regimes. You are then free to make an argument that those fluxes are able to be produced by volcanoes using principles of physics and chemistry - If you can do so, I'll gladly change my mind. That is how science works.