The Vatican can sponsor as many conferences as it likes addressing the issue of climate change. But when the most powerful nation on earth decides to elect someone who insists that climate change is a hoax perpetrated by the Chinese and then appoints the former CEO of Exxon Mobil to be his Secretary of State, I think we can assume say that no amount of pleading, coaxing, and cajoling from the Vatican will make much difference. Still, I suppose it's worth a try. I mean, what else can you do under the circumstances?