I am not going to argue against that statement and it is undoubtedly true to some degree that the atom bomb tests did effect the atmosphere, but the ozone depletion correlated directly with the years the space shuttle was in use and if you look at the data objectively, there is also a correlation between the last solar maximum and ozone depletion and the mechanism of this is clearly understood and can be found on the internet. I have had much of my bookmarked and stored data either stolen or destroyed, but I can look it up for you if you like. Ozone is essentially three oxygen atoms bonded together (the normal state is two), and when impacted by solar radiation particles the bonds are broken.