Talk about an inconvenient truth: National Geographic explores the startling theory that the average global temperature could rise by as much as six degrees by the year 2100. It might not seem like much, but the consequences could be devastating to the planet. Can we prevent global warming... before it's too late? 2008/color/90 min/NR/widescreen.
Producer: Chad Cohen
Producer: French Horwitz
Producer: Jenny Kubo