In this Feb. 13, 2015 file photo, stacks and burn-off from the ExxonMobil refinery are seen at dusk in St. Bernard Parish, La.
In this Feb. 13, 2015 file photo, stacks and burn-off from the ExxonMobil refinery are seen at dusk in St. Bernard Parish, La. Gerald Herbert AP
In this Feb. 13, 2015 file photo, stacks and burn-off from the ExxonMobil refinery are seen at dusk in St. Bernard Parish, La. Gerald Herbert AP