Phoenix
Even without global warming, Phoenix has been the poster child for what’s known as the heat-island effect. Asphalt radiates solar heat like a stovetop, creating a heat island where farmlands and desert have been paved over to make room for tract housing and some four million vehicles. The heat island has become a large land mass. And it’s getting hotter. Global warming and runaway development could make Phoenix hell on Earth—with freeways.

