From an airplane at night, Williston appears an oasis of thousands of points of light on the Great Plains. Most are white or yellow, but some flicker bright orange. They are the oil drilling rig flares of the Bakken Shale formation — fires that burn night and day. But dozens of these fires have gone dark in the last eight months. Williston has been pummeled by plunging oil prices worldwide, which dropped from a $105 a barrel in February 2014 to $54 in February 2015. […]