CNBC | New year, new oil industry hurdles in 2015 CNBC Last year was a tumultuous year for oil, with Brent crude prices declining around 50 percent since June on the back of an over-supplied market and lack of global demand. From "old school" oil producers Russia and Saudi Arabia in the east to shale oil ... Oil prices higher as 2015 gets underway Saudi Arabia Is Making A 'Serious Mistake' LETTER: A new twist to an old oil-pricing game |