Pope Francis celebrates mass at the Sao Sebastiao Cathedral in Rio de Janeiro, July 27, 2013. Pope Francis urged young people on Friday to change a world where food is discarded while millions go hungry, where racism and violence still affront human dignity and where politics is more associated with corruption than service. REUTERS/Luca Zennaro/Pool (BRAZIL – Tags: TPX IMAGES OF THE DAY RELIGION) – RTX121ME
