** FILE ** Former U.S. Vice President Al Gore speaks in front of a poster for his documentary film on global warming, "An Inconvenient Truth," during the Japanese premier in Tokyo, In this Monday, Jan. 15, 2007 file photo. (Associated Press)
**FILE** Former U.S. Vice President Al Gore talks during an interview on Jan. 29, 2013, in New York. Gore, who takes aim in his new book at the corporate media for "suffocating the free flow of ideas," defended the sale of his own television channel to Al-Jazeera. (Associated Press)