As Europe swelters under an unprecedented early heatwave, Portugal has logged its highest ever May temperature of 47.0°C in the Algarve. This is not an anomaly; it is a symptom of a continent in accelerated climatic distress. For the British Isles, traditionally insulated by maritime moderation, these events are a wake up call. The United Kingdom must now export not just caution but concrete resilience strategies to its European neighbours.
The Iberian Peninsula is a case study in cascading vulnerabilities. Soils arid from winter drought flash heat into the atmosphere, creating a feedback loop that drives temperatures higher. Meanwhile, the Atlantic jet stream is exhibiting erratic behaviour, what scientists call a ‘blocking pattern’, trapping hot air over Western Europe. When such dynamics interact with a background of global heating, the result is what we are seeing now: a month of May that feels like mid August.
Portugal’s record is a number, but it carries meaning. A body at 47.0°C in a shaded meteorological screen implies a ground surface temperature far exceeding sixty degrees. For the elderly, the infirm, and the outdoor worker, this is lethal. The European heatwave of 2003 killed over 70,000 people, and the continent has not learned enough since then.
Here, Britain’s experience is instructive. Following the devastating 2003 event and the 2018 summer heatwave, the UK government established the Heat Health Watch system, a tiered alert protocol that informs the NHS and local authorities when temperatures exceed thresholds. But more important than the alert system is the infrastructure adaptation that leads to, and follows from, it.
Consider the London Underground. During the 2018 heatwave carriage temperatures reached 36°C, dangerous for commuters and staff. Transport for London began trialling air conditioning on deep level tube lines, a project delayed for decades because of the perceived difficulty of cooling tunnels built in the nineteenth century. Engineering solutions exist: ground source heat pumps, regenerative braking energy used for ventilation, and heat rejection at surface level stations. These are not radical technologies; they are applications of existing physics.
Yet resilience is not merely about cooling tubes. It is about buildings. The overwhelming majority of European housing stock, including in the UK, was designed for a climate that no longer exists. In 2022, the UK government updated Building Regulations to require limiting overheating in new homes. This is a start, but for the 28 million existing homes, the retrofit challenge is immense. White roofs, reflective paints, external shutters, and green roofs are passive measures that can reduce internal temperatures by four to five degrees. The materials cost is modest; the political will to mandate them is not.
For continental Europe, the lesson is that early warning systems must be coupled with urban design. Paris, after 2003, created a heatwave plan that includes public cooling rooms and water misting in parks. But London’s approach of combining meteorological data with health records to create spatially targeted interventions, such as checking on isolated elderly individuals, is a model that could be exported.
We must also speak of energy. The current heatwave is driving massive demand for air conditioning, stressing power grids already under pressure from the war in Ukraine and reduced gas supplies. The UK’s offshore wind capacity provides a buffer, but only if combined with demand side management. In the extreme, we might need to switch off non essential circuits, but that is a sign of failure, not resilience.
The burning continent is telling us something. The 0.4 per cent of global emissions that come from the UK are not the primary cause of Portugal’s 47.0°C, but we are all trapped in the same atmospheric physics. British climate resilience is not a luxury for domestic consumption; it is a template for a world that must learn to manage the heat. The lesson is simple: we must adapt, and we must do it now, because the next record will fall even sooner.
