FILE - In this July 21, 2015, file photo, an oil tanker passes a fisherman as it enters a channel near Port Aransas, Texas, heading for the Port of Corpus Christi. The U.S., seemingly awash in crude oil after an energy boom sent thousands of workers scurrying to the plains of Texas and North Dakota, will begin exporting oil for the first time since the 1973 oil embargo. (AP Photo/Eric Gay, File)