SAN FRANCISCO - In an effort to lure an Internet-savvy generation back to their television sets, former Vice President Al Gore joined investors Monday to announce the creation of Current, a cable TV channel that will target younger viewers with a blend of news, culture and personal videos. Gore will serve as chairman of the board of the new venture, which will be based in San Francisco. He and Joel Hyatt, the founder of Hyatt Legal Services who will serve as Current's chief executive, assembled an investment team that paid $70 million last year to acquire the Newsworld International channel...