Hormuz, Trump, & The Carbon Paradox

The recent crisis at the Strait of Hormuz has offered a unique lens through which to examine the complex relationship between geopolitical disruptions and carbon emissions. The strait, a critical chokepoint for global oil and liquefied natural gas flows, also influences aviation routes, shipping, and fuel prices worldwide. When tensions escalated in April 2026, the resulting interruptions led to a significant but temporary suppression of fossil fuel demand across multiple sectors, offering a counterintuitive example of how conflict can momentarily reduce emissions—not through systemic improvement, but through constrained activity. Aviation was among the hardest hit sectors, with a sharp decline in flights, especially from Middle Eastern carriers that dominate long-haul routes. The disruption caused a reduction in global flown aircraft seat kilometres by between 3.5% and 6%, translating into an estimated avoidance of 0.9 to 2.5 million tonnes of jet fuel consumption. This fuel saving corresponds to roughly 2.8 to 7.9 million tonnes of direct CO2 emissions avoided, with broader climate impact considerations potentially raising this figure further. However, the analysis emphasises that these figures are scenario-based estimates rather than precise measurements, highlighting the inherent uncertainties in modelling such complex events. Road transport fuel demand also fell, influenced by rising fuel prices, work-from-home policies, and driving restrictions implemented during the crisis. Despite the relatively inelastic short-term response of road fuel consumption to price changes, suppressed demand was estimated at approximately 0.25 million barrels per day, equating to around 3 million tonnes of avoided CO2 emissions over the month. This reduction was not purely due to price sensitivity but also behavioural adjustments prompted by the crisis, underscoring the multifaceted drivers behind fuel consumption patterns. Shipping activity experienced significant delays, with a dramatic drop in vessels transiting the strait and many tankers anchored offshore. While ships consume less fuel when stationary, much of this activity was postponed rather than cancelled, meaning fuel savings were temporary. The analysis suggests that while fuel burn decreased during the anchorage period, the overall emissions impact is more complex due to the eventual resumption of voyages, illustrating the challenges in assessing net carbon effects in sectors characterised by deferred rather than destroyed demand. The Hormuz incident exemplifies the paradoxical nature of emissions reductions linked to crises: short-term declines in fossil fuel use arise not from sustainable transitions but from disruptions that strain global energy systems. While these events can temporarily lower emissions, they do not substitute for deliberate climate policies or technological advancements. Understanding the scale and sector-specific responses to such shocks is crucial for policymakers and analysts aiming to disentangle transient effects from genuine progress towards decarbonisation.