On Tuesday, the mercury in Churu, Rajasthan, touched 47 degrees Celsius. That is not a typo. It is a data point, a physical measurement of a planet that is growing more energetic by the decade. Churu is often called India's hottest city, and this week it claimed the title again. But the significance of this number extends far beyond the Thar Desert. It is a signal of stress in a system that underpins the global economy. The United Kingdom has announced a new round of funding for climate resilience in South Asia. This is sensible, but it is also reactive. The deeper question is whether we are building resilience fast enough to keep supply chains from fracturing under the heat.
Let us examine the physics. A 47-degree air temperature on a tarmac or a factory rooftop means surface temperatures exceeding 60 degrees. Steel expands, electronic components degrade, agricultural yields plummet, and human labour becomes physically dangerous. In Churu, this is an annual crisis. In the context of global supply chains, it is a disruption vector. India is a key producer of pharmaceuticals, textiles, and IT services. When a heatwave hits a logistics hub, the effects propagate through the network like a speeded-up film of a wheatfield catching fire.
The UK's funding, part of its Climate Resilience Programme, is directed at improving early warning systems and heat-adaptive infrastructure. This is laudable. But early warnings do not cool a server room. They do not stop concrete from cracking. The uncomfortable reality is that adaptation is a catch-up game. We are retrofitting a system that was designed for a climate that no longer exists.
Consider the broader picture. The Intergovernmental Panel on Climate Change (IPCC) projects that heatwaves in South Asia will increase in frequency and intensity. What was a one-in-50-year event in 1990 is now a one-in-five-year event. By 2050, it could be annual. The global supply chain is a finely-tuned machine. It relies on predictable conditions. Heatwaves are unpredictable, and their unpredictability is a threat multiplier.
But there is a more fundamental issue. Heatwaves are not just about temperature. They are about energy. A hotter atmosphere holds more water vapour, leading to more erratic rainfall, more flooding, and more crop failure. The 47 degrees in Churu is a symptom of a larger energy imbalance. The planet is trapping more heat than it is radiating back to space. That excess energy must go somewhere. It goes into the air, the oceans, and the ice sheets. It manifests as extreme weather. It is not a partisan statement. It is a thermodynamic fact.
What can be done? First, decarbonise. The energy transition is the only long-term solution. Second, redesign supply chains for redundancy and flexibility. That means diversifying sourcing, investing in cold chains, and protecting workers. Third, fund research into heat-tolerant crops and materials. But let us be clear: these measures are stopgaps. They buy time. They do not solve the problem.
The UK's investment is a drop in a bucket that is rapidly filling. The global cost of heatwave-related supply chain disruptions is estimated at billions per year, and it is rising. We need a scale of investment that matches the scale of the threat. That means carbon pricing, massive infrastructure spending, and international coordination. It is not happening fast enough.
I am not a alarmist. I am a physicist. The data are clear. The planet is warming. The consequences are here. Churu at 47 degrees is not an anomaly. It is a preview. The question is whether we will treat it as a warning or as a new normal. If it is the latter, then we are not building resilience. We are building denial.
For now, the UK has pledged funds. That is something. But something is not enough when the thermodynamic truth is staring at us from a broken thermometer.
