Watch Clip

Why extreme heat is more dangerous than many realize
6m 38s
Tens of millions of people living in the Southwest are dealing with what the National Weather Service says it's one of the longest heat waves in modern record. That extreme heat is even more dangerous than some might realize. Geoff Bennett discussed that with Jeff Goodell, a climate journalist and author of "The Heat Will Kill You First: Life and Death on a Scorched Planet."