Why a 'feverish' Arctic will affect everyone on the globe

A historic heat wave is occurring in the Arctic, already the fastest-warming place on Earth due to the increasing accumulation of greenhouse gases. Dr. Merritt Turetsky, director of the Institute of Arctic and Alpine Research at the University of Colorado Boulder, has studied the Arctic for decades. She joins William Brangham to discuss causes and consequences of the Arctic's rising temperatures. PBS NewsHour is supported by - https://www.pbs.org/newshour/about/funders