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Up until the end of February, a steady flow of ships bound for destinations across the world would pass daily through the Strait of Hormuz. A narrow channel running between Oman and Iran, the waterway serves as the only natural maritime link between the Persian Gulf and the global economy. That all changed on March 2, when, after days of military strikes led by the U.S. and Israel, Iran effectively closed the strait for the first time in history and warned that any ships passing through would be fired upon. Ever since, vessels moving through the channel have been attacked and set ablaze, and hundreds of tankers remain stranded. At least 1,800 people have been killed in the war, including Iran’s supreme leader Ayatollah Ali Khamenei and other top government officials.

The Persian Gulf is a linchpin of the planet’s oil and gas production; normally, roughly one-fifth of global oil and gas flows through the strait. Now, as it remains embattled, oil and gas prices have surged, and many experts warn an energy crisis is imminent. Restaurants across India are scaling back operations and warning of closures amid fuel shortages from the maritime blockade, while cooking gas prices are spiking in Sri Lanka.

Another world crisis sparked by the war in Iran may also be in the offing. That’s because the region’s oil and gas production has made it one of the world’s leading exporters of nitrogen fertilizers, which are indispensable to the global food system. To produce the chemicals used to grow much of the planet’s crops, natural gas is broken down to extract hydrogen, which is combined with nitrogen to make ammonia, and then mixed with carbon dioxide to make urea. All told, nearly a third of the global trade for nitrogen fertilizer passes through the Strait of Hormuz, while almost half of the world’s sulfur, essential in producing phosphate fertilizers, also travels through the corridor.

The waterway is a lifeline for food, too. Palm oil exports coming from Southeast Asia face potential major disruptions. Grain shipments headed to Gulf countries reliant on rice and wheat imports have been stalled.

“A worrying amount of food, or inputs into modern agriculture, are going through this very small channel,” said Ginni Braich, a data scientist who studies food insecurity at the University of Colorado Boulder’s Better Planet Laboratory. She estimates that the strait is in the top 20th percentile of all the worlds’ transportation corridors just based on the sheer volume of food that passes through it. The sudden and........

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