Global warming is a fact. There are those who don't want to accept that, since either their jobs depend on denying it, or else they fear that they may be personally discomforted by any attempt to do something about it. Well, not doing something will discomfort you worse.

Pope Francis is thr only pope with any sort of credentials in science -- he was a chemist. Interestingly enough, Margaret Thatcher had an advanced degree in chemistry, and she accepted the fact of global warming. She was enough of a scientist to (1) understand the scientific arguments and (2) refused to reject good science.