Cities Are Redesigning Public Space Around Extreme Heat

What happened?

Municipal governments across multiple continents have accelerated heat-adaptation infrastructure programmes this summer, as another year of record or near-record temperatures has pushed extreme heat further up the list of urban planning priorities. Seville, Athens, Phoenix, Ahmedabad and several Australian cities have all expanded programmes that range from reflective ‘cool pavement’ coatings and expanded tree canopy targets to mandatory shade requirements for new bus stops and playgrounds.

The World Meteorological Organization has continued to report that recent years rank among the warmest on record globally, and public health agencies in several countries have logged heat-related hospitalisations and deaths during summer heatwaves, reinforcing pressure on city governments to treat heat as core infrastructure planning rather than an emergency-response afterthought.

Key points

• The World Meteorological Organization has confirmed that recent years rank among the hottest on record, with 2023 and 2024 setting successive global temperature records.
• Phoenix, Arizona operates one of the first municipal Offices of Heat Response and Mitigation in the United States, coordinating cooling centres and cool-pavement pilots.
• Seville became one of the first cities to name and categorise heatwaves in a manner similar to hurricanes, aiming to raise public awareness of risk levels.
• Ahmedabad’s Heat Action Plan, first adopted in 2013, is widely cited by the World Bank and WHO as a model that other Indian and South Asian cities have since replicated.
• The WHO estimates that heat-related mortality is significantly under-reported in official statistics, complicating efforts to measure the true public health toll.

What we know

Multiple national meteorological agencies, including the US National Oceanic and Atmospheric Administration and the EU’s Copernicus Climate Change Service, have documented a clear long-term warming trend accompanied by a rise in the frequency and intensity of heatwaves, particularly in urban areas subject to the ‘urban heat island’ effect, where dense construction, dark surfaces and limited vegetation cause cities to run several degrees warmer than surrounding rural areas. Copernicus has repeatedly confirmed successive months and years as among the warmest recorded in the modern instrumental record.

City-level responses vary widely in ambition and funding. Phoenix, one of the hottest large US cities, has documented measurable temperature reductions from cool-pavement pilots, though independent researchers note the technology’s effectiveness depends heavily on maintenance and can, in some configurations, increase heat exposure for pedestrians at eye level even while lowering surface temperature. Tree canopy expansion is broadly viewed as more reliably effective but takes years to deliver benefits, creating a policy trade-off between fast, technology-based fixes and slower, longer-lasting natural cooling.

Background

Interest in urban heat governance intensified after a series of deadly heatwaves over the past two decades, including the 2003 European heatwave estimated to have caused tens of thousands of excess deaths, and repeated summer heat emergencies in South Asia, the Gulf and the southwestern United States. These events prompted a wave of academic research into urban heat islands and, gradually, policy responses, beginning with emergency cooling centres and evolving toward structural changes in building codes, street design and public transit infrastructure.

Ahmedabad’s 2013 Heat Action Plan, developed after a severe 2010 heatwave, is frequently cited as a turning point because it combined early-warning systems, public communication and targeted support for outdoor workers at relatively low cost, demonstrating that effective heat adaptation does not necessarily require large capital investment. The WHO and the Indian government have since supported the replication of similar plans across dozens of Indian cities and other countries in South and Southeast Asia.

Detailed analysis

Urban heat adaptation is increasingly understood by planners as a portfolio problem rather than a single-technology fix. Reflective coatings, expanded tree canopy, shaded transit infrastructure, building code changes requiring better insulation and ventilation, and behavioural interventions such as early-warning alerts and adjusted outdoor work schedules each address different parts of the exposure pathway, and cities with the most developed heat strategies — Phoenix, Ahmedabad, Athens and Singapore among them — tend to combine several of these measures rather than relying on one.

A recurring tension in the policy debate is equity. Lower-income neighbourhoods in many cities have measurably less tree cover and more heat-absorbing surfaces than wealthier districts, a pattern researchers have linked in the United States to historical redlining and unequal municipal investment. This means heat exposure is not distributed randomly, and adaptation spending that fails to prioritise historically under-invested areas risks entrenching existing health and economic disparities rather than reducing them.

Financing remains a constraint almost everywhere. Tree planting, cool-roof retrofits and transit shading require sustained multi-year budgets that compete with other municipal priorities, and several cities have turned to a mix of national climate adaptation funds, green bonds and public-private partnerships to fill gaps. The pace of implementation, researchers note, still lags behind the pace of warming in most cities studied.

Why it matters

Extreme heat is already one of the deadliest weather-related hazards globally, and its toll is expected to rise as average temperatures increase, according to climate science bodies including the Intergovernmental Panel on Climate Change. Because heat disproportionately affects outdoor workers, older people, people with chronic illness and residents of poorly insulated or under-shaded housing, urban heat policy sits at the intersection of climate adaptation, public health and social equity in a way few other infrastructure debates do.

The economic stakes are also significant: heat reduces labour productivity, particularly in outdoor and manual sectors, and increases peak electricity demand for cooling, straining grids that in some regions are already under pressure from other sources of demand growth, including data centres.

What happens next?

More cities are expected to appoint dedicated heat officers or offices, following the model pioneered by Phoenix, Athens and Miami-Dade County, and to integrate heat-resilience requirements into building codes and zoning rules. International bodies including the WHO and the World Bank are likely to continue promoting Heat Action Plans as a low-cost, high-impact intervention for cities in lower-income countries with limited capital budgets.

Watch for continued debate over cool-pavement effectiveness as more independent field data accumulates, and for growing pressure on national governments to fund municipal heat adaptation through dedicated climate resilience budgets rather than leaving cities to finance measures alone.

Insight Media Opinion

Insight Media Opinion: Heat adaptation is one of the clearest cases where modest, well-targeted public spending produces outsized returns in lives saved and productivity preserved, and cities that continue to treat it as an emergency-response issue rather than core infrastructure are making a costly mistake. Ahmedabad’s experience shows that effective adaptation does not require Phoenix-scale budgets — early warning systems, shaded bus stops and outdoor-worker protections can be implemented relatively cheaply and quickly.

The equity dimension deserves more attention than it currently receives in most cities’ heat strategies. Directing tree-planting and shading investment first toward historically under-served neighbourhoods, rather than distributing it evenly or according to political visibility, would do more to reduce heat-related mortality and address the specific harms of historical disinvestment than any single cooling technology on its own.