Stacks and burn-off from the Exxon Mobil refinery are seen at dusk in St. Bernard Parish, La., on Feb. 13, 2015.
Stacks and burn-off from the Exxon Mobil refinery are seen at dusk in St. Bernard Parish, La., on Feb. 13, 2015. Gerald Herbert AP file
Stacks and burn-off from the Exxon Mobil refinery are seen at dusk in St. Bernard Parish, La., on Feb. 13, 2015. Gerald Herbert AP file