Former Vice President Al Gore sounded the alarm about the climate crisis in the 2006 Oscar-winning film “An Inconvenient Truth.” 15 years after its release, Gore tells Lester Holt that the “crisis is getting worse, much faster than we are yet mobilizing solutions for it.” | NBC Nightly News with Tom Llamas

Jessica Savitch, a prominent news anchor, gained national attention for her coverage of the Iranian Hostage Crisis in 1979 while anchoring NBC Nightly News. Born in Kennett Square, PA, and a graduate of Atlantic City High School, Savitch began her career at KYW-TV, where she quickly became a local celebrity. Her impressive work caught the attention of NBC News, and she joined the network in 1977. Most of Savitch’s national news career was spent at NBC, where she became widely recognized as the a

“Live from the Berlin Wall…” Tom Brokaw reports on the historic night in 1989. We're celebrating Brokaw's first 50 years with NBC News. Read some of his colleagues' fondest memories of working with him: http://nbcnews.to/2k73Ozf | NBC News

WATCH: Tom Brokaw with some thoughts tonight on where things stand and where things are headed as the nation prepares to elect a new president -- (tap the video for sound) | NBC Nightly News with Tom Llamas