The heat dome that has been intensifying over western Europe has forced the closure of schools across half of France. Red heat alerts, the highest level, now cover 44 departments. The French meteorological service has warned of temperatures reaching 42 degrees Celsius in the shade. This is not an anomaly. This is the physical reality of our warming planet.
I have been following the energy budget of the Earth for two decades. The mechanism is straightforward. Carbon dioxide and other greenhouse gases trap infrared radiation. More trapped energy means greater thermal inertia. That inertia now manifests as these persistent high-pressure systems, these heat domes, that sit over continents and cook them.
The data are clear. The year 2023 is on track to be the hottest on record. We have had the hottest June. The hottest July. The hottest August in many regions. The North Atlantic has seen sea surface temperatures two to three degrees above normal. The Antarctic sea ice extent has been at record lows for months. The biosphere is responding.
France closed schools not out of caution but because the infrastructure cannot cope. Buildings built for a temperate climate now heat up to dangerous levels. The human body has limits. When the wet-bulb temperature exceeds 35 degrees Celsius, sweating stops being effective. Core temperature rises. Organs fail. This is physiology, not politics.
The French government has opened cooling centres and deployed water misting stations. The elderly, the young and those with chronic conditions are most at risk. But the problem is systemic. The energy transition from fossil fuels to renewables is not happening fast enough. We are still pouring 36 billion tons of carbon dioxide into the atmosphere every year. That is like setting 140 million jumbo jets on fire.
Some will point to technological solutions. Carbon capture, direct air capture, solar radiation management. These are engineering proposals that might work at scale in the 2040s or 2050s. But the physics does not wait for our innovation. The climate system has a response time. We have already committed to decades of further warming due to past emissions.
The heatwave in France is a taste of what is to come. Every region of the world will experience this. Some will suffer worse. The Mediterranean basin is a climate change hotspot. The number of heatwave days has already increased by 20 percent since the 1950s. By 2050, it could be 50 percent.
I do not say this to despair. I say this because we need clarity. The wall is approaching. We can either steer the car or brace for impact. France closing schools is not a policy choice. It is a symptom of a system under stress. The question is whether we will treat the cause or only manage the symptoms.
The cause is our energy system. The solution is decarbonisation. Every tonne of carbon we leave in the ground is a fraction of a degree of warming avoided. Every kilowatt-hour of solar or wind energy reduces the heat load on the planet. The technology exists. The economics are favourable. What is missing is the political will.
This heatwave will pass. The schools will reopen. But the underlying trend will not. The Earth's energy imbalance continues. The heat trapped by our emissions will keep accumulating. We need to stop adding to it. That is the only real solution. Everything else is just adaptation to a worsening reality.
