WASHINGTON (Reuters) - Al Gore -- star of an Oscar-winning movie, former U.S. vice president and the object of 2008 presidential speculation -- on Wednesday took his crusade against global warming to Capitol Hill. Glad-handing like the lifelong politician he was until losing the 2000 presidential race to George W. Bush, Gore called his return to Congress "an emotional occasion." But he did not mince words on what he termed the current climate crisis: "Our world faces a true planetary emergency." Before a joint House panel dealing with energy, air quality and the environment and the Senate Environment and Public...