Associated Press: U.S., European and other envoys at the U.N. climate conference took an overnight break in final talks early Saturday as they worked to resolve a dispute over how ambitious the goal should be in negotiating future cutbacks in global-warming gases. U.N. Secretary-General Ban Ki-moon was arriving in Bali later Saturday morning, either to announce the successful launching of the "Bali Roadmap" negotiations, or to help break any lingering impasse. Yvo de Boer, the U.N. …