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More Shade for the Rich: Study Exposes Global Urban Heat Inequality

New MIT research shows how wealthier neighbourhoods enjoy more tree shade, exposing global heat inequality and offering solutions for fairer urban cooling.

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Wealthier Neighbourhoods Enjoy More Tree Shade, Exposing Global Heat Inequality. New Study Finds
Image credit: David McBee/Pexels

As extreme heat becomes a growing global concern, one of the most effective cooling tools remains remarkably simple: trees. Research has long shown that greater tree coverage in cities helps reduce surface temperatures, improve public health outcomes, and make walking more comfortable in high heat.

Yet a new international study led by researchers at MIT reveals that access to this natural relief is far from equal. Tree cover — and the shade it provides — varies drastically within cities, closely tracking neighborhood wealth.

“Shade is the easiest way to counter warm weather,” said Fabio Duarte, an MIT urban studies scholar and co-author of the study, in a media statement. “Strictly by looking at which areas are shaded, we can tell where rich people and poor people live.”

The research team analyzed sidewalk shade in nine cities across four continents: Amsterdam, Barcelona, Belem, Boston, Hong Kong, Milan, Rio de Janeiro, Stockholm, and Sydney. Despite major differences in climate, wealth, and urban form, every city showed the same trend: affluent areas consistently enjoy more tree-shaded sidewalks.

Duarte noted that this imbalance was striking even in cities globally recognized for greenery. “When we compare the most well-shaded city in our study, Stockholm, with the worst-shaded, Belem in northern Brazil, we still see marked inequality,” he said in a media statement. “Even though the most-shaded parts of Belem are less shaded than the least-shaded parts of Stockholm, shade inequality in Stockholm is greater. Rich people in Stockholm have much better shade provision as pedestrians than we see in poor areas of Stockholm.”

The findings were published in the journal Nature Communications, in a paper titled Global patterns of pedestrian shade inequality. The research team includes scholars from Hong Kong Polytechnic University, the Amsterdam Institute for Advanced Metropolitan Solutions, and members of the MIT Senseable City Lab.

A Global Look at Uneven Shade

To quantify shade, the team used satellite imagery and detailed urban economic data to measure sidewalk coverage on both the summer solstice and the hottest day each year from 1991 to 2020. They assigned each neighbourhood a score between 0 and 1, with higher numbers indicating better shade.

Cities differed sharply in total tree cover — for instance, Stockholm’s neighbourhoods often score above 0.6, while large portions of Rio de Janeiro fall below 0.1. But the inequality within each city was consistent: the wealthiest neighbourhoods always had the greatest shade.

Even in cities known for strong environmental planning, disparities remained. “In rich cities like Amsterdam, even though it’s relatively well-shaded, the disparity is still very high,” said Lukas Beuster, a study co-author. “For us the most surprising point was not that in poor cities and more unequal societies the disparity would be notable — that was expected. What was unexpected was how the disparity still happens and is sometimes more pronounced in rich countries.”

Not all trends were uniform. Some cities, such as Barcelona and Milan, featured lower-income neighborhoods with strong shade coverage. Still, across the global sample, economic status remained a powerful indicator of access to cool, walkable streets.

Why Shade Matters — and What Cities Can Do

Sidewalks became the focal point of the study because they are crucial public spaces used daily by commuters, especially those without access to air conditioning or private vehicles. As cities worldwide face rising temperatures, researchers argue that shade must be treated as essential infrastructure.

“When it comes to those who are not protected by air conditioning, they are also using the city, walking, taking buses, and anybody who takes a bus is walking or biking to or from bus stops,” Duarte explained in a communication from MIT. “They are using sidewalks as the main infrastructure.”

Given the scale of disparity, the researchers suggest one clear strategy: target tree planting along public transit routes, where pedestrian activity is highest and where lower-income residents are most likely to walk.

“In each city, from Sydney to Rio to Amsterdam, there are people who, regardless of the weather, need to walk,” Duarte said . “Therefore, link a tree-planting scheme to a public transportation network. … If you follow transit, you will have the right shading.”

Beuster added that cities should think of urban trees as functional assets, not just aesthetic ones, emphasizing their central role in cooling and public health.

Duarte further stressed the importance of prioritizing shade where people actually move through the city. “It’s not just about planting trees,” he said in a media statement. “It’s about providing shade by planting trees. If you remove a tree that’s providing shade in a pedestrian area and you plant two other trees in a park, you are still removing part of the public function of the tree.”

“With increasing temperatures, providing shade is an essential public amenity,” he added in a media statement. “Along with providing transportation, I think providing shade in pedestrian spaces should almost be a public right.”

EP Staff is the editorial team at EdPublica, an independent media organisation focused on science, education, environment and public policy. The team produces evidence-based news, features, explainers and analysis on issues that shape society and everyday life.

Climate

Europe Braces for Extremes as Commission Unveils Climate Resilience Framework

The EU climate resilience framework aims to help cities, businesses and communities prepare for heatwaves, droughts and floods.

Sebin Pious

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The EU climate resilience framework aims to help cities, businesses and communities prepare for heatwaves,
Floodwaters inundate a European city street, submerging roads and the ground floors of buildings. As extreme rainfall and flooding intensify with climate change, the European Commission is pushing for a stronger framework to help cities and communities prepare for growing climate risks. Representative image. Photo: Valentin Ivantsov/Pexels

The EU climate resilience framework aims to help Europe prepare for intensifying heatwaves, droughts and floods. Unveiled by the European Commission, the initiative seeks to strengthen climate risk assessments, improve disaster preparedness and integrate climate adaptation into public policy and economic planning.

Europe is warming at roughly twice the global average, and is already bearing the brunt of long heatwaves, severe droughts and heavy floods. With three in four Europeans living in cities and urban areas, where these threats are growing, the European Commission has presented a new EU Framework for Climate Resilience.

The goal is to change how the continent anticipates, prepares for and handles climate risk. Rather than reacting to disasters after they happen, the framework aims to build climate safety into every major policy area.

EU Climate Resilience Framework and the Case for Action

Recent extreme weather has been costly. According to the Commission, estimated economic losses from climate damage between 2022 and 2025 reached about €200 billion.

Adapting infrastructure and preparing the economy for future extremes will require investment of around €70 billion a year. The Commission argues that spending early still makes sense, because returns on adaptation can exceed ten times the sum invested by preventing loss and damage. The global market for climate adaptation solutions is also expected to grow to €3.5 trillion by 2050, giving European industry a chance to innovate and lead.

A Shared Scientific Baseline and Simpler Rules

At the core of the package is a proposed Climate Resilience Law, which would set a common warming baseline grounded in current science. It assumes global temperatures will rise by 1.5°C above pre-industrial levels by 2030, 2°C by 2050 and 3°C by 2100, giving member states a shared benchmark for risk assessment and decision-making.

To cut paperwork and delays, the law would replace fragmented national planning requirements with a single national strategic plan. Regular, improved climate risk assessments would also keep national and EU-wide strategies aligned.

Practical Tools for Public Authorities and Businesses

The framework introduces digital tools on a new online European platform to help communities, businesses and local authorities tackle climate risks:

  • The European Climate Viewer: Built by the European Centre for Medium-Range Weather Forecasts, this interactive map shows projected climate hazards across the continent. It will eventually draw on supercomputing power through the Destination Earth initiative.
  • The Navigator of Climate Resilience Tools: Created by the European Environment Agency, it helps users find suitable adaptation resources based on their location, sector and specific risks.
  • The Solutions Explorer: This showcases practical, tested adaptation solutions developed through the EU Mission on Adaptation to Climate Change.

From Heatwave Plan to 2028 Strategy

The Commission is moving ahead with the rollout immediately. Planned initiatives include a European Heatwave Plan, a Climate Insurance Alliance, a European Water Initiative, a PreparEU Advisory Group on disaster preparedness and a project to identify the 100 most vulnerable territories in Europe. A broader EU strategic plan on climate resilience is scheduled to be proposed in 2028.

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Delhi’s Air Quality Paradox: Lower Average, Higher Everyday Pollution

Delhi’s average AQI fell by 15.8 per cent in 2026, but its median AQI rose by 14.1 per cent. A new assessment examines what these contrasting numbers reveal about the city’s everyday pollution.

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A farmer burns crop residue in a harvested agricultural field as thick smoke rises into the air.

Delhi recorded only three days with an Air Quality Index (AQI) above 200 between September 15 and October 23 this year. During the same period in 2025, the number was 10. Its average AQI also fell from 169.3 to 142.6, a 15.8 per cent improvement.

But there is another number in the data. Delhi’s median AQI rose from 135 to 154 during the same period. This means that although the city experienced fewer days of severe pollution, the air quality on a typical day was worse than the previous year.

The difference matters when assessing the health effects of air pollution. People are exposed to the air they breathe every day, not just during episodes when pollution reaches severe levels. Prolonged exposure is associated with respiratory and cardiovascular diseases, while polluted air can also affect children’s lung development.

A new assessment by Climate Trends, covering Delhi’s air quality, crop-residue burning in Punjab and Haryana, and meteorological conditions between 2024 and 2026, examines this gap between seasonal averages and everyday exposure.

What the AQI Average Leaves Out

The mean AQI is calculated using daily readings across a given period. A few exceptionally polluted days can push this average upwards. The median, on the other hand, is the middle reading when all daily values are arranged in order. It offers a better indication of what a typical day looks like.

Climate Trends’ analysis found that Delhi’s mean AQI declined by 15.8 per cent between 2025 and 2026. However, the median increased by 14.1 per cent. The maximum AQI also came down from 353 to 245, while the number of days above 200 dropped from 10 to three.

The improvement in the mean, therefore, was largely associated with the reduction in extreme pollution days. It did not indicate an improvement in the typical daily reading.

Aarti Khosla, Director of Climate Trends, draws attention to this difference.

“The average AQI fell 15.8% this autumn, and that is the number that will get reported as improvement. But the typical day, the one most Delhiites actually live through, got worse, up 14.1%.”

She argues that air quality policies should be evaluated using the pollution levels people experience regularly, rather than seasonal averages alone.

Farm Fires and Delhi’s Pollution: Numbers Don’t Move Together

Every October, crop-residue burning in Punjab and Haryana becomes a major focus of Delhi’s air pollution debate. Smoke from these fires can travel towards the capital, contributing to particulate pollution. However, the extent of its impact depends on weather conditions and the movement of air.

The three-year assessment found that the relationship between farm fires and Delhi’s AQI varied considerably across the study period. Between September 15 and October 15, 2025, satellite observations recorded 201 crop-residue fire events in Punjab and Haryana. In 2026, the number was 193, a decline of just four per cent. Delhi’s mean AQI, meanwhile, fell by 15.8 per cent.

The statistical correlation between daily fire counts and Delhi’s AQI also weakened. The same-day correlation coefficient fell from 0.62 in 2025 to 0.17 in 2026. The previous year’s figures show a different pattern. Between 2024 and 2025, combined fire events declined by 88 per cent, but Delhi’s mean AQI fell by only 3.9 per cent.

These comparisons do not establish that agricultural burning has no effect on Delhi’s air. They show that the number of fires alone cannot explain the city’s year-to-year AQI changes.

Dr Palak Balyan, Research Lead at Climate Trends, explains that the movement of smoke depends on atmospheric conditions.

“Wind direction, wind speed, rainfall and atmospheric mixing determine whether smoke is transported towards Delhi, dispersed or removed from the atmosphere.”

The study also identifies traffic, industrial emissions, road and construction dust, and other regional combustion sources as contributors to Delhi’s pollution. However, it does not quantify how much each source contributed to the AQI changes recorded in 2026.

El Niño: Game Changer

The assessment also considers whether the strengthening El Niño conditions in 2026 could explain the changes in pollution and agricultural burning. El Niño refers to the periodic warming of sea-surface temperatures in the central and eastern equatorial Pacific Ocean. It influences large-scale atmospheric circulation and can affect rainfall and temperature patterns in different regions.

According to the NOAA Climate Prediction Center assessment cited in the report, the Niño-3.4 sea-surface temperature anomaly reached approximately +2.1°C by October 2026. NOAA also projected an 83 per cent or higher probability of strong-to-very-strong El Niño conditions continuing through January–March 2027.

Despite these conditions, the combined number of farm-fire events in Punjab and Haryana did not increase. Delhi’s mean AQI also declined.

The local meteorological data present a more complicated picture. Delhi’s accumulated rainfall between September 15 and October 23 fell from 46.70 mm in 2025 to 10.19 mm in 2026, a decline of 78.2 per cent. Its mean planetary boundary layer height (PBLH), which indicates the depth of the lower atmospheric layer where pollutants are mixed, decreased by 4.3 per cent.

Lower rainfall reduces the removal of airborne particles through precipitation. A lower boundary layer can also limit the vertical space available for pollutants to disperse.

Mean wind speed increased by 2.1 per cent, from 2.40 to 2.45 metres per second. Stronger winds can help disperse pollutants, but their effect depends on direction and the areas from which the air is moving.

Dr Sagnik Dey, Head and Vipula and Mahesh Chaturvedi Chair Professor in Policy Studies at the Centre for Atmospheric Sciences, IIT Delhi, cautions against using El Niño as a direct indicator of air pollution.

“El Niño should not be viewed as a direct predictor of air pollution. Its influence on regional air quality depends on how large-scale climate variability interacts with local rainfall, temperature, wind patterns and atmospheric stability.”

The assessment does not establish that El Niño caused the observed changes in Delhi’s AQI. It also cannot isolate the contribution of individual weather conditions or pollution sources to the decline in the city’s average reading.

Health Cost of an Ordinary Day

The distinction between average and median AQI has implications beyond how Delhi’s annual pollution figures are reported.

Dr Harshal Ramesh Salve, Professor at the All India Institute of Medical Sciences (AIIMS), Delhi, points out that the health burden of pollution develops through prolonged exposure, rather than only during a handful of severe pollution episodes.

He identifies impaired lung development in children and increased lifetime cardiovascular risks among adults as concerns associated with sustained exposure. He also recommends early screening for high-risk adults and treating clean air as a year-round public health priority.

The 2026 assessment does not show that Delhi has solved its pollution problem. Its findings show that a decline in the number of severe days can improve the seasonal average without improving the air quality people experience on most days.

The study points to a need to examine Delhi’s pollution beyond the seasonal AQI average. With the median AQI rising despite fewer severe pollution days, the improvement recorded in 2026 does not reflect cleaner everyday air. The contribution of traffic, industrial activity, construction dust and other local sources needs closer assessment, particularly since the study could not isolate their individual impact. Without that understanding, the reasons behind Delhi’s changing air quality will remain only partially explained.

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252 Million Hectares Under Restoration Across 149 Countries, but UN Warns of 2030 Target Gap

A UN report finds that 252 million hectares across 149 countries are under ecosystem restoration. However, increased investment and accelerated action are needed to meet global restoration targets by 2030.

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River flowing through a forested mountain landscape with evergreen trees and snow-covered peaks.
Healthy mountain forests and river ecosystems play an important role in maintaining biodiversity and ecological balance.Image credit:Pexels

Global efforts to restore degraded ecosystems have reached 252 million hectares across 149 countries, generating more than one million green jobs. However, a new United Nations assessment warns that restoration efforts remain insufficient to meet international biodiversity targets by 2030, calling for a more than fourfold increase in annual investment.

The findings are presented in the Restoration Progress Report: Nature’s Comeback – Scaling Ecosystem Restoration for People and Planet, released on October 29, 2026, by the United Nations Environment Programme (UNEP), the Food and Agriculture Organization (FAO) and the Secretariat of the Convention on Biological Diversity (CBD).

The report provides the first comprehensive global assessment of progress towards commitments to restore approximately one billion hectares of degraded ecosystems. These commitments are linked to the UN Decade on Ecosystem Restoration (2021–2030) and the Kunming-Montreal Global Biodiversity Framework, which calls for at least 30 per cent of degraded terrestrial, freshwater, marine and coastal ecosystems to be under effective restoration by 2030.

According to the assessment, the 252 million hectares currently documented under restoration represent the largest recorded global restoration effort. However, this accounts for only 34 per cent of the indicative global benchmark associated with the 2030 target.

Freshwater and marine ecosystems lag behind

The report identifies considerable differences in restoration progress across regions and ecosystem types. Asia accounts for the largest share of documented restoration, with 192.2 million hectares, followed by Africa with 36.3 million hectares and Europe with 9.1 million hectares. North and Central America account for 5.8 million hectares, South America 5.4 million hectares and Oceania 3.2 million hectares.

However, the report cautions that these figures should not be interpreted as a ranking of restoration performance, as they also reflect differences in regional land area and monitoring and reporting capacities.

Restoration of terrestrial ecosystems has reached nearly half of the global 2030 target. China reports the largest terrestrial restoration area, with 127.4 million hectares, while substantial restoration activities have also been documented in Mongolia and Kazakhstan.

Progress remains considerably slower in freshwater, marine and coastal ecosystems, despite these environments experiencing rapid degradation.

restoration
ecosystem

A river along the side of a dense forest. Image credit: Pexels

The assessment documents 11 million hectares of freshwater ecosystems under restoration across 62 countries and 5.7 million hectares of marine and coastal ecosystems across 46 countries. The report also notes that limited monitoring and reporting may mean that actual restoration activities in these ecosystems are higher than the documented figures.

Meanwhile, the share of countries reporting implemented wetland restoration or rehabilitation programmes has increased from 8 per cent in 2022 to 54 per cent.

Restoration financing needs to increase fourfold

Insufficient investment remains a major obstacle to achieving global restoration commitments. The report estimates that annual restoration financing must increase from US$64 billion to US$296 billion by 2030, representing more than a fourfold rise.

Agroforestry requires the largest estimated annual investment, at US$87 billion, followed by restorative reforestation at US$52 billion, peatland restoration at US$44 billion and seagrass restoration at US$28 billion.

The report identifies employment generation as another potential benefit of scaling up restoration. While more than one million green jobs have already been associated with restoration initiatives, increased global investment could generate up to 32 million additional jobs by 2030.

It also highlights the potential contribution of ecosystem restoration to climate mitigation and biodiversity protection. Research cited in the assessment indicates that restoring just 15 per cent of global priority areas could capture and store 30 per cent of carbon dioxide-equivalent emissions released since the Industrial Revolution and help prevent 60 per cent of projected species extinctions.

The report further identifies the participation and leadership of Indigenous Peoples and local communities as essential to ensuring long-term restoration outcomes. Secure land rights, stronger monitoring systems and sustained political commitment are among the priorities identified.

With five years remaining in the UN Decade on Ecosystem Restoration, the assessment calls on governments to move beyond isolated restoration projects towards coordinated, long-term programmes that address the underlying causes of ecosystem degradation.

It emphasises that the 2030 targets should serve as a milestone in the restoration process rather than its conclusion, as ecological recovery requires sustained action and investment beyond the end of the decade.

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