 This is NPR News. Morning Edition from NPR on WSHU. Summers in Phoenix have always been hot, needless to say, but the number of heat-related deaths there has skyrocketed over the past decade. Ten years ago, we'd see maybe 75 heat deaths per year. Last year, there were 645. We'll have more on some of the new measures that the city's taking to keep its residents safe from the heat that's ahead this hour on Morning Edition.