What’s behind recent extreme heat events and record high temperatures

Temperatures in New Delhi, India, where 35 million people live, reached 122 degrees Fahrenheit, leading to heat-related deaths and illnesses. In Mexico, howler monkeys have been dying off in 100-degree heat, and in the U.S., Miami just recorded its hottest May on record. William Brangham discussed what’s driving this with Andrew Pershing of Climate Central.