Associated Press: The United Nations on Monday warned world leaders they have only 70 days to reach a new deal to limit global warming. “Time is not just pressing. It has almost run out,” U.N. climate chief Yvo de Boer said of leaders’ dwindling time before they meet in Copenhagen to finalize a pact. “As many leaders have said, there is no Plan B,” he said. “If we don’t realize Plan A, the future will hold us to account for it.” But only hours after negotiations began, rich and poor …