15 It will, of course, be clear to you from this brief outline of the contents of this encyclical that We have no intention of dealing here with all the serious and pressing problems affecting humanity no less than the Church at this present time; such questions as peace among nations and among social classes, the destitution and famine which still plague entire populations, the advance of the new nations toward independence and civilization, the current of modern thought over against Christian culture, the difficulties experienced by so many nations and by the Church in those extensive parts of the world where the rights of free citizens and of human beings are being denied, the moral problems concerning the population explosion, and so on.
Source: Ecclesiam Suam (Vatican.va)