The ozone hole above Antarctica is healing, thanks to the Montreal Protocol

New data from the World Meteorological Organization finds the hole in the ozone layer above Antarctica is continuing to heal. It's expected to likely close entirely by mid-century. This success story can be directly linked the the Montreal Protocol, an international agreement that phased out the chemicals causing the ozone's depletion. The World's Host Marco Werman spoke with professor of political science Pamela Chasek about the legacy of the Montreal Protocol.