- oil tank at night; Shutterstock ID 83171149; PO: IHS Inc. ; Job: Image Library; Client: Energy/IHS

Oil storage tanks stand in this aerial photograph taken above Cushing, Oklahoma, U.S., on Tuesday, March 24, 2015. The fastest oil-inventory growth on record at the main U.S. hub may be about to end, easing concern that storage limits will be strained. Photographer: Daniel Acker/Bloomberg