Climate change is making heat waves longer, hotter, and more deadly.
In the U.S., heat deaths have more than doubled in Arizona in the last 10 years.
Last year, a dangerous heat wave hit while storms left residents in the D.C. and New York City metro areas without power.
Postal Service has also received criticism for its role in workers’ heat deaths, for example in a troubling report from HuffPost this past week.
In Europe, heat waves killed as many as 70,000 in 2003 and more than 1,500 last year.