Antonio Guterres starts his second five-year term as United Nations secretary-general this week. He spent much of his first term navigating very difficult relations with the administration of former U.S. President Donald Trump. He would like to spend the coming years overhauling the U.N. system to respond to challenges like climate change and inequality. Geopolitics may get in the way. Diplomats in New York rate Guterres as an extremely intelligent but instinctively cautious politician. He has had good reasons for caution. In addition to dealing with the mercurial Trump, Guterres has had to accommodate an increasingly influential China in the […]