The temperature in the Persian Gulf is not the only thing rising. Iran has intensified its territorial claims in the Strait of Hormuz, a chokepoint through which nearly a fifth of the world's petroleum transits. For a planet already grappling with an energy transition, this is a geopolitical fault line that could send shockwaves through global markets.
On Tuesday, Iranian Revolutionary Guard vessels conducted a series of manoeuvres within the strait, approaching a commercial tanker flagged to the Bahamas. The action, which Tehran described as a 'routine inspection', came hours after a senior Iranian official reiterated that the country would not hesitate to close the strait if its oil exports were further curtailed by sanctions. The British government responded by deploying a Type 45 destroyer, HMS Defender, to the region, citing the need to uphold freedom of navigation and ensure energy security.
The Strait of Hormuz is a hydrological anomaly just 33 kilometres wide at its narrowest point. It connects the Persian Gulf to the Arabian Sea, and its strategic importance cannot be overstated. At present, the world relies on hydrocarbons for roughly 80 per cent of its primary energy. A blockade, even a partial one, would trigger a cascade of price spikes that would reverberate through every sector of the global economy. The International Energy Agency has previously warned that a prolonged closure could reduce global oil supply by 20 per cent, a deficit that no amount of strategic reserves could fully mitigate.
This is not the first time Iran has weaponised its geography. Similar provocations occurred in 2018 and 2019, each time met with a multilateral naval response. However, the current situation carries additional weight. The world is in the midst of an energy transition, but the shift from fossil fuels to renewables is not yet complete. Solar and wind capacity have grown exponentially, but they cannot be stored or transported in the same way as oil and gas. A disruption in the Strait of Hormuz would hit the global energy system at its Achilles heel: the gap between current demand and the infrastructure needed to deliver alternatives.
For the United Kingdom, the stakes are specifically calibrated. The British economy imports roughly 40 per cent of its crude oil from the Persian Gulf region. While North Sea production provides some buffer, it has declined steadily since its peak in 1999. The government's own climate change committee has noted that the UK remains exposed to oil price volatility. A threat to the Strait of Hormuz is a threat to the cost of living, to industrial output, and to the fiscal headroom needed for green investment.
The science of climate change tells us that we must decarbonise rapidly. But the physical reality of our energy system is that we are still tethered to hydrocarbons. The Strait of Hormuz is a stark reminder that this tether is vulnerable. Every barrel of oil not burned is a barrel that cannot destabilise the climate. Yet every barrel not shipped through the strait is a barrel that can destabilise the economy.
The British naval presence is a short term response to a long term structural problem. It is necessary, but it is not sufficient. The only permanent solution is to reduce the global dependence on oil to the point where no single chokepoint holds the global economy hostage. That transition is under way, but it is not moving fast enough. The Iranian manoeuvres are a signal that the window for a smooth transition is narrowing. We must treat them as such.
