"Pope Francis to Explore Climate’s Effect on World’s Poor"
"VATICAN CITY — Ban Ki-moon arrived at the Vatican with his own college of cardinals. Mr. Ban, the United Nations secretary general, had brought the leaders of all his major agencies to see Pope Francis, a show of organizational muscle and respect for a meeting between two global institutions that had sometimes shared a bumpy past but now had a mutual interest." A roundup of stories about the papal encyclical to be released Thursday.