CNBC | Extended oil slump takes toll Tribune-Review FILE - In this Dec. 17, 2014, file photo, oil pump jacks work behind a natural gas flare near Watford City, N.D. As drivers, shippers and airlines continue to enjoy lower fuel prices, the oil industry is wrestling with layoffs and losses. (AP Photo ... Chevron's ugly earnings put focus on oil dividends Pain Worsens for Oil Giants Exxon and Chevron WRAPUP 4-Tumbling oil prices slam profit at Exxon Mobil, Chevron |