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. PBS NewsHour is supported by - https://www.pbs.org/newshour/about/funders