I don't think I've ever seen any discussion of Ozone from an FE perspective. I've long been skeptical about Ozone due to the fact that the climate change nuts have been using it to further their agenda. If it were 70% gone, I would think thinks would be much worse off than than they actually are. I don't think that anyone among FE would have the resources to determine whether it is in fact 70% gone. I'm not sure that the notion of such a layer would be in any way incompatible with the FE model.