Are there multiple causes of ozone depletion?

Yes. The number one cause is water vapor Other causes are compounds that contain chlorine and bromine. Natural sources of these compounds exist, but since Nature is not doing anything different, She is not "depleting" or changing the equilibrium value of ozone long term The hole has also not increased in size compared to the past 100 years either.1858 is still the record year for known large scale thinning.

This was not man induced either, but due completely to solar activity. Natural variances causes change.

I cant really gove you an answer,but what I can give you is a way to a solution, that is you have to find the anglde that you relate to or peaks your interest. A good paper is one that people get drawn into because it reaches them ln some way.As for me WW11 to me, I think of the holocaust and the effect it had on the survivors, their families and those who stood by and did nothing until it was too late.