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NAIROBI, KENYA - NOVEMBER 26:  Pope Francis arrives at the University of Nairobi for a public mass in downtown Nairobi on November 26, 2015, in Nairobi, Kenya. Pope Francis makes his first visit to Kenya on a five day African tour that is scheduled to include Uganda and the Central African Republic. Africa is recognised as being crucial to the future of the Catholic Church with the continent's Catholic numbers growing faster than anywhere else in the world.  (Photo by Nichole Sobecki/Getty Images) *** BESTPIX ***
NAIROBI, KENYA - NOVEMBER 26:  Pope Francis arrives at the University of Nairobi for a public mass in downtown Nairobi on November 26, 2015, in Nairobi, Kenya. Pope Francis makes his first visit to Kenya on a five day African tour that is scheduled to include Uganda and the Central African Republic. Africa is recognised as being crucial to the future of the Catholic Church with the continent's Catholic numbers growing faster than anywhere else in the world.  (Photo by Nichole Sobecki/Getty Images) *** BESTPIX ***

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Pope celebrates historic Mass in Kenya

Pope Francis celebrated a historic Mass in Kenya on Thursday before delivering a stern environmental warning just days ahead of a key climate change conference in Paris. CNN's Robyn Kriel has more.

Pope celebrates historic Mass in Kenya

Pope Francis celebrated a historic Mass in Kenya on Thursday before delivering a stern environmental warning just days ahead of a key climate change conference in Paris. CNN's Robyn Kriel has more.