For the first time, “Catholic leaders representing all regional and national bishops conferences” have come together in a “joint appeal.” According to reporting in the New York Times, Cardinal Oswald Gracias, archbishop of Mumbai, India, called the October 26 meeting at the Vatican a “historic occasion.” What brought all these Catholic leaders together for the first time? Not the refugee crisis in Europe. Not the plight of Christians in the Middle East. Not a prayer meeting or a Bible study. It was climate change.