A $5 billion plan to desalinate seawater in Mexico and pipe it to Phoenix is testing the notion that desert cities can keep growing as the Earth warms.
Across the country, local governments are accelerating their efforts to cut greenhouse gas emissions, in some cases bridging partisan divides. Their role will become increasingly important.
In the old days, we could escape the summer heat by heading north - to the Adirondacks in the East or to the cool, forested Pacific Northwest in the West. But this is not your grandparents' climate.
