Newsweek: The Vatican is set to hold a conference on climate change and sustainability next week, a month after the pope said changes in the global climate have made the Earth look like an immense pile of filth. The climate change meeting, which will be held July 21 and 22 alongside a meeting on human trafficking, was announced on Wednesday at a press conference in the Vatican. Both meetings will be attended by mayors from countries around the world to discuss how cities can help contribute to the solution...