The Iran war and the blockade of the Strait of Hormuz are rattling global energy markets, with fears of rising fuel prices and wider economic fallout. International Energy Agency chief Fatih Birol warns the world could face a serious energy shock. Former CIA executive William Usher joins DW to assess the risks and who may be hit hardest. Chapters: 00:00 Energy crisis at historic scale 00:26 Strait of Hormuz blockade drains global reserves 01:55 Interview with security expert William Usher 02:20