Global food security is underpinned by trade in a few crops and fertilizers. Just three crops – maize, wheat and rice – account for around 60 per cent of global food energy intake.1 A fourth crop, soybean, is the world’s largest source of animal protein feed, accounting for 65 per cent of global protein feed supply.2 Each year, the world’s transport system moves enough maize, wheat, rice and soybean to feed approximately 2.8 billion people.3 Meanwhile, the 180 million tonnes of fertilizers applied to farmland annually play a vital role in helping us grow enough wheat, rice and maize to sustain our expanding populations.4 International trade in these commodities is growing, increasing pressure on a small number of ‘chokepoints’ – critical junctures on transport routes through which exceptional volumes of trade pass. Three principal kinds of chokepoint are critical to global food security: maritime corridors such as straits and canals; coastal infrastructure in major crop-exporting regions; and inland transport infrastructure in major crop-exporting regions.A serious interruption at one or more of these chokepoints could conceivably lead to supply shortfalls and price spikes, with systemic consequences that could reach beyond food markets. More commonplace disruptions may not in themselves trigger crises, but can add to delays, spoilage and transport costs, constraining market responsiveness and contributing to higher prices and increased volatility.