Newsweek magazine delivered to your door Newsweek Voices: Diverse audio opinions Enjoy ad-free browsing on Newsweek.com Comment on articles Newsweek app updates on-the-go ...

The big picture: Heat alerts remain in effect for ... Between the lines: Studies show climate change is causing heat waves to be more intense, longer-lasting and more frequent.

(Photo by Mario Tama/Getty Images) I intended for this column to ... I received quite a bit of feedback on my previous column on the Phoenix heat wave, and I want to address that first.