Crews battle wildfires in U.S. West as smoke travels the world

PORTLAND, Ore., Sept 16 (Reuters) — As fire crews continued to battle deadly wildfires sweeping the western United States, thousands of evacuees in Oregon and other states faced a daily struggle while scientists in Europe tracked the smoke on Wednesday as it spread on an intercontinental scale. With state resources stretched to their limit, President Donald Trump on Tuesday night approved a request from Oregon's governor for a federal disaster declaration, bolstering federal assistance for emergency response and relief efforts. Dozens of fires have burned some 4.5...