(A priest delivers communion to the faithful in St. Peter's Square during the inauguration Mass for Pope Francis at the Vatican, Tuesday, March 19, 2013. Pope Francis urged princes, presidents, sheiks and thousands of ordinary people gathered for his installation Mass on Tuesday to protect the environment, the weakest and the poorest, mapping out a clear focus of his priorities as leader of the world's 1.2 billion Catholics. (AP Photo/Domenico Stinellis))
