The encyclical letter Laudato Si is available here on the Vatican website.
224. Sobriety and humility were not favorably regarded in the last century.
I would offer a caution about over-reaching on this analysis. I thought there was quite a bit of false humility, as well as a surface sobriety that concealed hidden indulgences. Pope Francis is talking about motivations, not appearances.
And yet, when there is a general breakdown in the exercise of a certain virtue in personal and social life, it ends up causing a number of imbalances, including environmental ones. That is why it is no longer enough to speak only of the integrity of ecosystems. We have to dare to speak of the integrity of human life, of the need to promote and unify all the great values. Once we lose our humility, and become enthralled with the possibility of limitless mastery over everything, we inevitably end up harming society and the environment.
Calling to mind the mutual admiration (at least on the surface) between Mr Trump and Mr Putin.
It is not easy to promote this kind of healthy humility or happy sobriety when we consider ourselves autonomous, when we exclude God from our lives or replace him with our own ego, and think that our subjective feelings can define what is right and what is wrong.