Narrated and hosted by Matt Damon, the 13th episode of “Journey to Planet Earth” investigates one of the most critical issues of our time: the link between severe weather events, global warming and threats to our national security. Emmy-award winning filmmakers Marilyn and Hal Weiner consult with experts to find out what is happening to our weather. Lester Brown, Carol Browner and Paul Krugman are among those interviewed.

Directed and produced by Marilyn Weiner and Hal Weiner.