A ferocious heatwave is tightening its grip across Europe, with Germany recording its highest temperature ever measured and British authorities scrambling to implement emergency protocols. The mercury at Jena in Thuringia hit 42.6 degrees Celsius on Monday, preliminary data shows. That reading, if confirmed, would surpass the previous record of 41.2 degrees set in July 2019. Schools have closed from Berlin to Frankfurt. Railways are operating under reduced speed limits due to track buckling risks. Emergency services have reported a sharp rise in heat stroke and dehydration cases, particularly among the elderly.
The atmospheric driver is a persistent omega block: a stagnant high-pressure system anchored over central Europe, pulling desert air north from the Sahara. This is happening on top of a baseline warming of the continent by roughly 2 degrees Celsius compared to preindustrial times. The physics is straightforward: a warmer atmosphere holds more moisture, which traps more heat overnight. Without respite, the human body cannot recover. Night temperatures in German cities have not dipped below 25 degrees Celsius for five consecutive nights.
British emergency planners, already reeling from a record 40.3 degrees in July 2022, have now activated COBR-level protocols in anticipation of a similar event. The Met Office has issued its first ever red warning for extreme heat covering large parts of England from Tuesday through Thursday. Modelled projections show a 60 percent probability of exceeding 41 degrees in London. The NHS has cancelled non-urgent appointments and set up cooling centres in community halls. London Underground stations lack air conditioning; the network will run slower to avoid overheating.
This is not an anomaly. The global energy imbalance, driven by carbon dioxide concentrations now at 420 parts per million, loads the dice for these extremes. For every degree of global warming, the chance of a heatwave like this increases by a factor of three to five. The infrastructure we built in the 20th century was designed for a climate that no longer exists. German nuclear plants have already had to reduce output because river water used for cooling is too warm. French reactors are being shut for the same reason. The irony is not lost on energy ministers.
What science can tell us: this will keep happening. Each tonne of carbon we emit commits the planet to roughly 0.0000000001 degrees of additional warming. The cumulative effect of global emissions since 1750 is now baked in for centuries. Mitigation is the only lever we have left. Adaptation buys time, but without rapid decarbonisation our grandchildren will see records broken every year.
For now, the focus is on getting through the next 72 hours. Check on neighbours. Do not exercise in midday heat. Drink water. The planet is sending a bill, and it is coming due.
