It's possible that Houston will never entirely recover from Hurricane Harvey. The event may exceed the physical damage that Hurricane Katrina did to New Orleans. It may bankrupt large insurance companies and dramatically raise the risk of doing business anywhere along the Gulf and Atlantic coasts of the USA - or at least erase the perceived guarantee that losses are recoverable. It may even turn out to be the black swan that reveals the hyper-fragility of a US-driven financial system.

Houston also happens to be the center of the US oil industry. Offices can be moved elsewhere, of course, but not so easily the nine major oil refineries that sprawl between Buffalo Bayou over to Beaumont, Port Arthur, and then Lake Charles, Louisiana. Harvey is inching back out to the Gulf where it will inhale more energy over the warm ocean waters and then return inland in the direction of those refineries.

The economic damage could be epic. Much of the supply for the Colonial Pipeline system emanates from the region around Houston, running through Atlanta and clear up to Philadelphia and New York. There could be lines at the gas stations along the eastern seaboard in early September.