Climate gentrification: the rich can afford to move – what about the poor?

As people flee intense heat in Arizona for gentler climes, rental and property values soar. But what about those left behind?

Only half-jokingly, some residents of a progressive city 300 miles north of the Mexican border have adopted the "build the wall" slogan in the face of a wave of newcomers. But these perceived interlopers are starkly different from Donald Trump's imagination.

They are American, mainly white and are fleeing the unlivable heat.