Climate Apartheid and the Cruel Shadow Line of Segregation Across European Cities

https://shop.elsevier.com/books/eco-efficient-materials-for-reducing-cooling-needs-in-buildings-and-construction/pacheco-torgal/978-0-12-820791-8

As my colleagues and I prepare the new edition of Eco-efficient Materials for Reducing Cooling Needs in Buildings and Construction (linked above), the heat dome that suffocated Europe in late May 2026 made clear: cooling can no longer be dismissed as a footnote to the climate crisis. It is becoming a precondition for survival, dignity, social equality and ordinary urban life in increasingly overheated cities. Portugal registered a May temperature record of 40.3 °C in Mora, while France endured its hottest May day ever recorded — midsummer arriving weeks too early on a continent warming more than twice as fast as the global average.

A recent study reveals what this overheating actually does to urban life across different social groups. Writing in PNAS Nexus, researchers analysed mobile-phone mobility data covering 13 million people, providing an unusually large-scale picture of how extreme heat alters everyday movement and activity. They found that mobility falls by up to 10% on hot days and by as much as 20% on hot afternoons, precisely when exposure becomes most dangerous and the need for effective cooling becomes most urgent.https://academic.oup.com/pnasnexus/article/5/4/pgag078/8651395

Predictably, the burden is not shared equally. Older adults retreat most sharply from daily life, while lower-income people remain more exposed because avoiding work is a privilege they cannot afford. Social mixing declines and activity drains from city centres. Extreme heat does not merely raise electricity bills or mortality figures; it quietly turns cities into places where normal life becomes increasingly reserved for those with the resources to escape indoors.

The conclusion should now be impossible to avoid: cooling is no longer a matter of comfort, architectural refinement or reduced energy consumption. It is about whether people can still work, move, meet and inhabit their cities as Europe rapidly, relentlessly and dangerously overheats — and whether the poorest will once again be forced to pay the highest price. Eco-efficient cooling materials are no longer a niche energy-saving solution. They are part of the basic infrastructure required to prevent liveable cities from becoming a climatic privilege.

PS - The brutal truth behind all this is simple: when a city begins to divide between those who can buy their way into cooled interiors and those condemned to endure the street, the bus stop, the workplace and the overheated flat, we are no longer merely describing a heatwave. We are watching segregation being modernised quietly, brutally, and in plain sight — drawn no longer on maps, but on overheated bodies and homes, in poverty-weighted degrees Celsius.