Las Vegas is the fastest warming city in the United States. The city’s poorest residents are most at risk in the heat

The Clark county death investigator Jill Roberts vividly recalls the sunny 115F (46C) afternoon last summer when she entered a Las Vegas home with no functional air conditioning. The indoor heat felt even worse than the broiling temperature outside. She climbed up the stairs, through thick, stifling air, landing in a third-story bedroom where the resident had died in sweltering conditions. The room had no fan and the door was shut. It felt as if it couldn’t get any hotter.

“Our elements are unforgiving. Especially on those 115F days, it doesn’t take a lot,” Roberts told the Guardian. “In that situation I’ll go stand in the sun in the 115F heat to do my paperwork as opposed to staying in the house because it’s that hot.”