NBC Universal will devote a whopping 75 hours of air time to showing Al Gore’s "Live Earth: The Concerts for a Climate in Crisis.” And if Gore decides to run for president in 2008, the event would be "one of the largest ever, if not the largest, in-kind contributions to a presidential campaign,” according to The Media Research Center’s NewsBusters.org, a Web site dedicated to combating liberal media bias. In addition to devoting all of NBC-TV’s Saturday, July 7 prime time to the concerts, CNBC will carry seven hours of coverage from 7 p.m. to 2 a.m. EDT, Bravo will...