It's been a record hot summer in many cities across the nation. Phoenix is no exception. This Sonoran Desert metropolis already records more days over 100 degrees than any other major U.S. city. Now, climate models predict Phoenix will soon get even hotter.
A hotter future may mean a more volatile environment — and along with it, natural disasters, greater pressure on infrastructure, and an increased physical toll on city residents.
China became a majority urban country this year. No nation has shifted so quickly from rural to urban than China, where more than half of the people now live in urban areas.
Everyone is familiar with megacities like Beijing and Shanghai, but they are just a tiny part of China's urbanization story. The country has more than 160 cities with populations of a million or more — places most of the world is only vaguely familiar with, if at all.
Interstate 81 runs through the heart of Syracuse, N.Y., where a 1.4-mile-long elevated stretch of the highway is known locally as "the viaduct." Like many road projects built in the middle of the last century, I-81 is bumping up against the end of its life span. While officials say it's still safe to drive on, the highway is crumbling in parts.