20190313T1414-1776-CNS-IN-DEPTH-NUCLEAR-VOICES.jpg

In this 2017 file photo, Pope Francis greets people attending a conference on building a world free of nuclear weapons, at the Vatican. The conference brought together 11 Nobel laureates, top officials from the United Nations and NATO, diplomats from around the world, experts in nuclear weapons and the disarmament process, scholars, activists and representatives of bishops' conferences. (CNS/L'Osservatore Romano)