Mainichi Daily News: The world’s top diplomat, UN Secretary General Ban Ki-moon, appeared at work Friday wearing a short sleeved shirt without a suit jacket or a tie. Surrounded by his senior managers in relaxed outfits on the 38th floor of the UN headquarters building, he was advocating a recently unveiled one-month pilot project, “Cool UN,” an energy-saving initiative that was inspired by the Japanese “Cool Biz” campaign and other existing programs around the world. “I’m a rather formal type of person, …