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Pope Francis: Climate Change A 'Principal Challenge' For Humanity

Cardinals follow a news conference to present Pope Francis' encyclical "Laudato Si," or "Praise Be," at the Vatican on Thursday. The far-reaching papal letter addressed climate change and the poor. (AP)
Cardinals follow a news conference to present Pope Francis' encyclical "Laudato Si," or "Praise Be," at the Vatican on Thursday. The far-reaching papal letter addressed climate change and the poor. (AP)

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