MONTREAL (AP) -- In a surprise visit, former President Clinton will speak at the annual U.N. climate conference Friday, final day of a contentious two-week meeting, the United Nations confirmed. Bush administration envoys here were said to be displeased at Thursday's news of the unusual appearance - of an ex-president at a critical point in backroom negotiations involving the U.S. delegation. "They haven't protested formally, but they're annoyed," a source in the Canadian government, the conference host, said of the U.S. delegates. "They're not infuriated, but they're not thrilled." The source spoke on condition of anonymity, because as a civil...