POTUS is essentially giving the finger to the Holy See and it's veiled threats.
"That study only found substantial damage to the U.S. economy under an extreme global warming scenario of 15 degrees Fahrenheit by 2100 — twice the United Nations’ worst-case scenario called RCP8.5."
Not even 3 days prior the Vatican released this announcement.
"Moving far beyond traditional Catholic moral teaching, the bishops hazarded to say that people have “a moral duty to keep global warming to well below 2°C above pre‐industrial levels and pursuing efforts to limit the temperature increase to 1.5°C above pre‐industrial levels.”
and this
"A fair and just ecological transition, as required by the Paris Agreement, “is a matter of life or death,” the bishops warned."
The vatican is shilling for the U.N to generate more funds. Oh and guess who founded the U.N?
The Holy See
Sources:
https://www.breitbart.com/environment/2018/11/26/vatican-warns-climate-change-key-challenge-our-age/