Which channel aired a television program hosted by an American journalist in 2010 and talked about the worst case future of humans?
Earth 2100: Earth 2100 is a television program that was presented by the American Broadcasting Company (ABC) network on June 2, 2009 and was aired on the History Channel in January 2010 and was shown through the year. Earth 2100:  Hosted by ABC journalist Bob Woodruff, the two-hour special explored what "a worst-case" future might look like if humans do not take action on current or impending problems that could threaten civilization. Bob Woodruff: Robert Warren "Bob" Woodruff (born August 18, 1961) is an American television journalist.
History Channel