FILE PHOTO: Crude oil storage tanks are seen from above at the Cushing oil hub, appearing to run out of space to contain a historic supply glut that has hammered prices, in Cushing, Oklahoma, March 24, 2016. REUTERS/Nick Oxford//File Photo
FILE PHOTO: Crude oil storage tanks are seen from above
FILE PHOTO: Crude oil storage tanks are seen from above at the Cushing oil hub in Cushing