One year ago this month, world leaders gathered in Paris to sign an agreement pledging to curb global warming. This week, Pope Francis took them to task for not doing enough to follow through on it. Prominent scientists, including physicist Stephen Hawking, attended a Vatican meeting where Francis urged nations to focus on climate change and not be distracted by other issues, such as politics. And Francis had another well-known guest at the Vatican this week. Oscar-winning director Martin Scorsese and his family had a private audience with the pope. They were in Rome for special screenings of Scorsese’s new film, “Silence,” which is about the persecution of Catholics in seventeenth-century Japan. The central figures in the film are Jesuit missionaries. Francis himself at one time had hoped to become a missionary in Japan, but health issues prevented him from doing it.