Associated Press: With a digital clock ticking in giant red numbers, U.N. climate negotiators ended another round of talks this week, nibbling at the edges of a new climate change treaty but frustrated — again — at failing to reach the heart of an accord. After 16 months of talks by thousands of delegates from some 190 countries, it’s time to try something else. Later this month, the spotlight shifts from the unwieldy negotiations involving nearly every country on earth to the world’s 17 most …