Heat Divide

Every summer, India is reminded that climate change is no longer a future threat but a present reality. Yet the true measure of the crisis is not found in temperature records or meteorological bulletins. It is found in the widening gap between those who can escape the heat and those who cannot. When temperatures climb past 45 degrees Celsius in cities such as Delhi, the burden is not shared equally. Air-conditioned homes, offices, malls and private vehicles offer protection to those who can afford them.

For millions of others, particularly workers in the informal economy, extreme heat is simply another occupational hazard that must be endured to earn a living. This is where the climate debate intersects with questions of labour, urban planning and social justice. India’s cities run on the efforts of street vendors, delivery personnel, construction workers, domestic workers, rickshaw pullers and countless others whose livelihoods depend on remaining outdoors for long hours. As heatwaves become longer and more intense, these workers face a cruel choice: risk their health or lose their income. The economic consequences extend far beyond individual hardship.

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Reduced productivity, lost work hours and heat-related illnesses translate into significant costs for the wider economy. Sectors dependent on outdoor labour are especially vulnerable. What appears at first glance to be a weather event is increasingly becoming a development challenge capable of slowing growth and deepening inequality. Nor is this challenge confined to Delhi. From Ahmedabad and Jaipur to Kolkata and Hyderabad, urban India is confronting similar pressures. What appears today as a metropolitan problem is rapidly becoming a national one, affecting cities with different climates, economies, and demographics. The problem is compounded by the way Indian cities have evolved.

Expanding concrete surfaces, shrinking green spaces, inadequate shade and congested neighbourhoods create urban heat islands that trap warmth long after sunset. For many low-income families, relief does not arrive when the workday ends. Poorly ventilated homes and unreliable electricity often make nights nearly as oppressive as afternoons, preventing recovery from prolonged exposure. Governments have responded with heat action plans, public advisories and emergency measures. These are necessary and welcome. Yet they are only the beginning. Advising people to avoid outdoor work during peak temperatures has limited value when missing a day’s wages means sacrificing a family’s next meal.

Climate resilience cannot be built solely through warnings; it requires investments in housing, public cooling infrastructure, reliable power supply, urban greenery and workplace protections for vulnerable workers. The larger lesson is clear. Extreme heat should no longer be treated as an occasional seasonal inconvenience. It has become a structural challenge that touches public health, economic productivity and social stability. The question facing India is not whether hotter summers are coming. They are already here. The question is whether the country’s institutions can adapt quickly enough to ensure that survival does not remain the price of earning a livelihood.