A U.S. Coast Guard handout aerial view of the tugboat Signet Enterprise with it's crew -- later rescued -- standing in the bow of the partially submerged vessel, near Port Aransas, Texas, Aug. 26, 2017. Hurricane Harvey's devastation points out a vulnerability of American oil energy: the concentration of refineries and chemical plants along a Gulf Coast that is vulnerable to bad weather. (U.S. Coast Guard via The New York Times) EDITORIAL USE ONLY
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