17 July, 2026

The true value of a heatwave isn’t measured in degrees, but in pounds.

For years heatwaves have been treated as environmental or public health problem. We have all become way too familiar with the sweaty commutes, sleepless nights and health warnings that come with the spell of extreme heat.

The impacts are serious but have tended to sit in the climate conversation rather than the economic one.

That separation is beginning to disappear. Extreme heat is now showing up in the workplaces and systems that keep the country running. Research suggests productivity falls once temperatures exceed 30°C. Rail services slow when tracks expand, shops close to protect staff and customers and hospitals face extra pressure as admissions rise. These aren’t just climate impacts; they are interruptions to everyday economic life.

So, when does heat become an economic issue? The moment the disruption carries a measurable cost. This may sound like a subtle distinction but it changes the conversation entirely. Environmental impacts are often discussed as future risks, whilst economic impacts demand immediate action. Once this shift happens, it makes it harder for it to be ignored.

Perhaps there’s an opportunity hidden within this shift. Putting a price tag on heatwaves changes the conversation. Adaptation measures are no longer seen as purely environmental spending but opportunities of investment in economic resilience; not just what it costs to prepare for a hotter future, but what it costs not to.

As heatwaves become more frequent, the economic case for action may prove just as compelling as the environmental one.

By Mariama Frimpong