U.N. panel paints grim future for humanity without drastic action to combat climate change

Summary: A new report out Monday warns that global temperatures will continue rising in coming decades, and that human activity is driving that increase. Those are among the conclusions reached by the U.N.'s Intergovernmental Panel on Climate Change. Michael Oppenheimer, a professor of geosciences and international affairs at Princeton University, joins William Brangham to discuss. PBS NewsHour is supported by - https://www.pbs.org/newshour/about/funders