Rating is available when the video has been rented.
This feature is not available right now. Please try again later.
Published on Jan 31, 2019
The Polar Vortex is hitting parts of the U.S. with record-breaking temperatures. But some are wondering, what happened to global warming? We asked David Kanter, Assistant Professor of Environmental Studies at NYU to break things down for us. » Subscribe to NBC News: http://nbcnews.to/SubscribeToNBC » Watch more NBC video: http://bit.ly/MoreNBCNews
NBC News Digital is a collection of innovative and powerful news brands that deliver compelling, diverse and engaging news stories. NBC News Digital features NBCNews.com, MSNBC.com, TODAY.com, Nightly News, Meet the Press, Dateline, and the existing apps and digital extensions of these respective properties. We deliver the best in breaking news, live video coverage, original journalism and segments from your favorite NBC News Shows.