VATICAN CITY, VATICAN - JUNE 14: Pope Francis waves to the faithful as he arrives in St. Peter's Square for a meeting with the Roman Diocesans on June 14, 2015 in Vatican City, Vatican. The Pontiff invited everyone to pay attention to environmental issues during his Sunday Angelus blessing. His upcoming encyclical 'Laudato Sii' on the environment will be launched at a Vatican on Thursday. (Photo by Franco Origlia/Getty Images)
