On the Global Livable Cities Index, the first U.S. city doesn't appear until No. 17

There are about a million and three different ways to rank cities -- here, here, and here as examples -- but it is broadly relevant to do so, or at least have some metrics assigned to cities. In the 1950s, about 1/3 of the world lived in cities. By the 2050s, the belief is that close to 80 percent of the world will live in cities. That's a huge shift ov…