Associated Press: The United States and Europe faced off into the final day of the U.N. climate conference Friday, deadlocked over how ambitious the goal should be in negotiating cutbacks in global-warming gases after 2012. U.N. Secretary-General Ban Ki-moon will return to Bali to help resolve the impasse, the outcome of which may help determine how high the planet’s temperatures rise for decades to come. Delegates sparred over the wording of a conference final document until 2:30 a.m., said Yvo …