Al Gore, who has reversed his political fortunes to become a potential contender in the 2008 presidential race, made an emotional return to Congress Wednesday in an appeal for an even more dramatic rescue—saving the planet. Gore—who is one of voters' top choices for the Democratic presidential nomination even though he says he's not running—implored lawmakers to adopt a list of policy prescriptions to stop global warming. Fresh off a triumphant Academy Awards appearance in which his climate change documentary "An Inconvenient Truth" won two Oscars, Gore drew overflow crowds as he testified before House and Senate panels about a...