COPENHAGEN — Has Copenhagen collapsed? That seems to be the growing sentiment inside the city's Bella Conference Center, where officials, environmentalists and even delegates to the international climate conference began streaming out Friday evening. What began with excitement and anticipation two weeks ago ended Friday night with disappointment and anger for thousands. "This is a sad day for my country," said Mama Konate, chief delegate from the West African nation of Mali. "We have worked very hard to reach this agreement. And now it seems over. Without a deadline, I don't know if we will ever finish." The conference, the...