Associated Press: When international negotiators reached a first-of-its kind climate change agreement in Paris this month, the United Nations' normally low-key leader, Ban Ki-moon, celebrated onstage, arms raised in victory and more exuberant than many had ever seen him before. Nearly nine years had passed since, in his first days as secretary-general, Ban surprised world leaders by making global warming a top item on his agenda. Now, on the eve of his final year in office, the cheers in Paris marked the culmination...