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New York Mayor Bill de Blasio, center, arrives in the Synod Hall to attend a conference on Modern Slavery and Climate Change at the Vatican, Tuesday, July 21, 2015. Dozens of environmentally friendly mayors from around the world are meeting at the Vatican this week to bask in the star power of eco-Pope Francis and commit to reducing global warming and helping the urban poor deal with its effects. (AP Photo/Gregorio Borgia)

New York Mayor Bill de Blasio, center, arrives in the Synod Hall to attend a conference on Modern Slavery and Climate Change at the Vatican, Tuesday, July 21, 2015. Dozens of environmentally friendly mayors from around the world are meeting at the Vatican this week to bask in the star power of eco-Pope Francis and commit to reducing global warming and helping the urban poor deal with its effects. (AP Photo/Gregorio Borgia)

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