(Pope Francis waves to crowds as he arrives to his inauguration Mass in St. Peter's Square 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/Oded Balilty))
