I cannot address the climate change issues other than to say that the Vatican may not be hearing or listening to both sides of the argument. In a broader sense, we are all called to be environmentalist as stewards of the earth. That part is Christian. For me it means fighting pollution wherever and whenever possible and preserving wild lands as much as possible for their value and for our use of them.
[This post is from the author's comments on Facebook about the Pope's recent encyclical.]