Dinner discussion topic: The Pope's statement on climate change

The Pope has released his position on climate change (see NY Times coverage) which is leading to vigorous debate and discussion. What do you and your guests think about this?  Has he crossed a line or is his position about preserving life on Earth and reducing human suffering on target?  Why do you think what you think?  Will this change your (or your guests') behavior?  If so, how?  If not, why not?