United Press International: Salmon in the Columbia River and other U.S. streams could face an uncertain future if global temperatures continue to warm, experts say. Experts such as aquatic ecologist Robert Bilby say that with river temperatures increasing, the cold-water fish could soon find themselves fighting for survival, The (Portland) Oregonian reported Sunday. Bilby, who helped assess the changing climate’s impact on the U.S. salmon population, said the appearance of more than 100 dead salmon in a …