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Associated Press
U.N. Secretary-General Ban Ki-moon, right, talks to the media during a press conference, at the Vatican, Tuesday, April 28, 2015. Ban Ki-moon, who earlier in the morning met Pope Francis during a private audience, opened a Vatican conference on the environment that is a key part of the Holy See's rollout of Francis' eagerly awaited encyclical — a pope's most authoritative teaching document — which is expected in June.(AP Photo/Andrew Medichini)

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