SDG 11 Sustainable Cities and Communities: Goals, Challenges & Solutions

According to UN-Habitat (2023), approximately 1.1 billion people live in slums or informal settlements — a quarter of the world's urban population — lacking adequate housing, clean water, or sanitation. Cities account for roughly 70% of global CO₂ emissions yet concentrate more than 80% of global economic output. How we build and retrofit cities over the next decade will be the single largest lever for both climate action and human wellbeing. Cities are humanity's greatest invention and its most pressing challenge. They concentrate creativity, commerce, and culture — but also pollution, inequality, and vulnerability. As the world crosses the threshold where more than half its population lives in urban areas, the question of what kind of cities we build has never been more consequential.

Sustainable Development Goal 11 — SDG 11: Sustainable Cities and Communities — is the United Nations' dedicated framework for ensuring that urbanization serves people and the planet rather than undermining both. Unlike SDG 13, which targets climate action at a systemic level, or SDG 9, which focuses on industrial infrastructure, SDG 11 zeroes in on the lived experience of urban residents: the affordability of their homes, the safety of their streets, the quality of the air they breathe, the parks within walking distance, and the resilience of their neighborhoods when disasters strike.

This guide covers every major dimension of SDG 11 — its targets, the scale of the challenge, the proven solutions, and the role every person can play. Whether you are an urban planner, a student, a business leader, or a concerned citizen, understanding SDG 11 is essential to understanding the future of human civilization. For a broader look at the full framework, see our overview of sustainable development and the complete sustainability landscape.

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What Is SDG 11 Sustainable Cities and Communities

SDG 11 is United Nations Sustainable Development Goal 11, adopted in 2015 as part of the 2030 Agenda. Its overarching aim is to make cities and human settlements inclusive, safe, resilient, and sustainable. It encompasses 10 specific targets covering affordable housing, slum upgrading, accessible public transport, participatory urban planning, cultural heritage protection, disaster risk reduction, air quality, waste management, green public spaces, and national urban development policies.

SDG 11 sits at the intersection of almost every other global goal. Cities account for roughly 70% of global CO₂ emissions, consume over 60% of global energy, generate more than 70% of global GDP, and house the majority of the world's poor. That convergence makes urban sustainability a master lever: progress on SDG 11 accelerates progress on poverty reduction (SDG 1), clean water and sanitation (SDG 6), affordable and clean energy (SDG 7), decent work and economic growth (SDG 8), and reduced inequalities (SDG 10).

The 10 targets of SDG 11 are:

1. 11.1 — By 2030, ensure access for all to adequate, safe, and affordable housing and basic services, and upgrade slums.
2. 11.2 — Provide access to safe, affordable, accessible, and sustainable transport systems for all, with special attention to women, children, persons with disabilities, and older persons.
3. 11.3 — Enhance inclusive and sustainable urbanization and capacity for participatory, integrated, and sustainable human settlement planning and management.
4. 11.4 — Strengthen efforts to protect and safeguard the world's cultural and natural heritage.
5. 11.5 — Significantly reduce the number of deaths and people affected by disasters, with a focus on protecting the poor and people in vulnerable situations.
6. 11.6 — Reduce the adverse per capita environmental impact of cities, including air quality and municipal waste management.
7. 11.7 — Provide universal access to safe, inclusive, and accessible green and public spaces, especially for women, children, older persons, and persons with disabilities.
8. 11.a — Support positive economic, social, and environmental links between urban, peri-urban, and rural areas.
9. 11.b — Substantially increase the number of cities adopting integrated policies on inclusion, resource efficiency, and disaster risk reduction.
10. 11.c — Support least developed countries in building sustainable and resilient buildings using local materials.

These 10 targets together define a comprehensive vision of what it means for a city to be truly sustainable — not just environmentally, but socially and economically as well. For context on where SDG 11 fits within the broader SDG framework, global sustainability.

How Does Urbanization Affect the Environment and Human Wellbeing

Urbanization's environmental impact is enormous and multidirectional. Cities convert natural land to impervious surfaces, create urban heat islands that raise local temperatures by 1–7°C above surrounding rural areas (IPCC), concentrate air and noise pollution, overwhelm natural water cycles with stormwater runoff, and generate disproportionate shares of global solid waste. At the same time, dense urban areas can be more resource-efficient per capita than sprawling suburbs when well-planned.

The scale of global urbanization is difficult to overstate. In 1950, only 30% of humanity lived in cities. Today that figure exceeds 57%, and the UN projects it will reach 68% by 2050. That means 2.5 billion additional urban residents over the next 25 years — nearly all of them in low- and middle-income countries in Africa and Asia, where urban infrastructure is already under severe strain.

The environmental consequences of poorly managed urbanization include:

• Land conversion: Urban expansion consumes roughly 1.2 million km² of natural land per year globally, destroying biodiversity habitat. biodiversity loss for the full picture.
• Urban heat islands: Dark paved surfaces and waste heat from buildings and vehicles raise city temperatures, increasing demand for air conditioning and exacerbating heat-related illness.
• Stormwater pollution: Impervious surfaces prevent rain infiltration, sending polluted runoff into waterways. Wastewater treatment systems in many cities cannot keep pace with growth.
• Solid waste overload: Cities generate over 2.1 billion tonnes of solid waste annually (World Bank), with the majority going to open dumps or inadequate landfills in low-income urban areas.
• Air quality degradation: Traffic, industry, and waste burning in cities are the primary sources of PM2.5 and NO₂ that drive respiratory and cardiovascular disease.

Yet urbanization also creates opportunities. High-density cities can support efficient public transit, reduce per-capita driving distances, share energy infrastructure, and concentrate resources for healthcare and education. The challenge of SDG 11 is confirming that the growth of cities captures these efficiencies while preventing the environmental harms. This is precisely the work covered by urban development practitioners worldwide.

What Are the Biggest Challenges Facing Urban Areas by 2030

The three most acute urban challenges threatening SDG 11 progress by 2030 are the global housing affordability crisis, the persistence of slums and informal settlements, and the accelerating threat of climate-related urban disasters. A fourth critical challenge — urban air pollution — kills more people annually than HIV, tuberculosis, and malaria combined, according to WHO data.

The housing affordability crisis is now global and worsening. In major cities across North America, Europe, Australia, and increasingly Asia and Latin America, median home prices have risen to 10–15 times median annual incomes — far beyond the traditional 3–4x affordability threshold. Rising rents are pushing lower-income residents into longer commutes, overcrowded conditions, or homelessness. The urban poverty rate is increasing even as national poverty rates decline in some regions, because the cost of urban living is outpacing wage growth.

Informal settlements and slums remain the defining urban challenge for the Global South. UN-Habitat estimates that 1.1 billion people — roughly one in four urban residents worldwide — live in slums characterized by overcrowding, lack of durable housing, inadequate access to clean water and sanitation, and insecure land tenure. In Sub-Saharan Africa, over 56% of urban residents live in informal settlements. The no poverty goal cannot be achieved without addressing the conditions in these communities.

Urban disaster risk is intensifying as climate change brings more extreme weather events and as cities grow into floodplains, coastal zones, and earthquake-prone areas. The UNDRR estimates that economic losses from urban disasters have tripled in real terms since the 1980s. Cities in Asia and Africa — where growth is fastest — face the greatest exposure. Floods, heat waves, and cyclones are increasingly disrupting urban economies and displacing millions.

Air pollution kills approximately 4.2 million people prematurely each year from outdoor (ambient) air pollution, with the majority of these deaths occurring in Asian and African cities (WHO). In many low- and middle-income cities, particulate matter (PM2.5) concentrations remain 5–10 times above WHO safe limits. The dominant sources are vehicle emissions, coal power, industry, and open waste burning — all of which are concentrated in cities.

Additional systemic challenges include:

• Inadequate public transit coverage, with only 53% of urban residents globally having convenient access to public transport (UN-Habitat)
• Deficit of safe, accessible public green spaces, particularly in rapidly growing cities in the Global South
• Weak urban governance and fragmented planning authorities that cannot coordinate housing, transport, and environmental policy
• Digital and spatial inequality within cities, where geographic segregation concentrates disadvantage in specific neighborhoods

What Is the Global Slum Crisis and How Can Cities Solve It

The global slum crisis is the large-scale concentration of urban residents in informal settlements that lack adequate housing, basic services, and secure tenure — affecting 1.1 billion people as of 2023 (UN-Habitat). Solving it requires a combination of in-situ upgrading programs that improve existing settlements without displacement, affordable housing construction, land tenure formalization, and investment in water, sanitation, and electricity access.

Slums are not simply a result of poverty — they are also a cause of it. The lack of clean water and proper sanitation access in informal settlements creates a disease burden that keeps residents trapped in poverty cycles. Children growing up in slums face greater exposure to waterborne diseases, indoor air pollution from cooking fires, and violence, all of which affect educational outcomes and lifetime earnings. The connection between urban housing quality and the broader fight against poverty is direct and well-documented.

The most successful slum upgrading programs share several characteristics:

• Community participation: Programs that engage residents in design and implementation achieve better outcomes and reduce forced displacement. Medellín's urban acupuncture approach, which connected hillside comunas to the city center with cable cars and escalators, was developed through extensive community engagement.
• Security of tenure: Providing residents with legal title to their land removes the fear of eviction that prevents investment in housing improvement, and enables access to credit.
• Incremental upgrading: Rather than wholesale demolition and relocation, successful programs improve existing structures with better materials, add piped water and sanitation, and widen pathways to allow emergency vehicle access.
• Cross-sectoral integration: The most effective programs connect housing improvement with school access, healthcare, employment programs, and public safety improvements.

Brazil's Favela-Bairro program, which upgraded over 60 favelas in Rio de Janeiro, is frequently cited as a model. India's Rajiv Awas Yojana (Slum Free City Plan) has formalized land tenure and improved services for millions of urban poor. South Africa's Breaking New Ground program provides subsidized housing to low-income families. None of these programs has been sufficient in scale given the pace of urban growth, but they demonstrate what is possible when governments treat slum upgrading as a priority rather than an afterthought.

The clean water and sanitation gap in informal settlements is particularly critical. An estimated 600 million urban residents lack access to safely managed drinking water at home, and over 1 billion lack access to safely managed sanitation (WHO/UNICEF Joint Monitoring Programme). Without addressing this gap, the health and dignity of slum residents will remain compromised regardless of other improvements.

How Does Urban Air Pollution Harm Cities and What Are the Solutions

Urban air pollution harms cities through four primary mechanisms: direct health damage from fine particulate matter (PM2.5) and nitrogen dioxide (NO₂) inhaled by residents; economic losses from reduced workforce productivity and healthcare costs estimated at $8.1 trillion annually (WHO); environmental degradation through acid deposition and eutrophication; and the exacerbation of urban heat islands when pollution-related smog traps heat. Solutions involve transitioning transport to electric and active modes, upgrading building energy systems, and eliminating open waste burning.

The WHO estimates that 99% of the world's population breathes air exceeding WHO guideline limits for at least one pollutant. For urban residents, the exposure is particularly acute. Fourteen of the world's 15 most polluted cities are in South Asia, with PM2.5 concentrations in cities like Lahore, Delhi, and Dhaka routinely exceeding 10–15 times the WHO annual guideline of 5 µg/m³. In these cities, air pollution is the single largest environmental health risk, contributing to chronic lung disease, heart attacks, and premature death at rates that rival — and in some cities exceed — smoking.

The main sources of urban air pollution vary by city context:

• Vehicle emissions: In most high-income and middle-income cities, road transport is the dominant source of NO₂ and a major source of PM2.5. Diesel trucks and buses are disproportionate contributors relative to their share of vehicle fleet.
• Residential burning: In many low-income cities, burning coal, wood, and biomass for cooking and heating inside homes is the primary source of indoor and outdoor PM2.5. Transitioning households to clean energy cooking is among the highest-impact interventions.
• Open waste burning: Burning solid waste — common in cities without formal waste collection — releases dioxins, furans, and PM2.5 at ground level, directly impacting nearby residents, typically the poorest.
• Industrial emissions: In rapidly industrializing cities, cement, steel, and chemical plants within or adjacent to urban areas contribute significantly to PM2.5 and sulfur dioxide.

Solutions that cities have successfully deployed include:

• Low emission zones (LEZs) that restrict or charge the most polluting vehicles in city centers — London's Ultra Low Emission Zone reduced roadside NO₂ by 44% in its first year
• Rapid expansion of electric bus fleets — Shenzhen, China became the first city to fully electrify its bus fleet (over 16,000 buses) and achieved measurable air quality improvements
• Investment in cycling and pedestrian infrastructure that shifts trips from cars to active transport modes
• Industrial relocation policies that move polluting facilities away from residential areas
• Waste collection improvements and waste-to-energy facilities that eliminate open burning

Air quality is directly linked to the carbon footprint of cities — many of the interventions that reduce greenhouse gas emissions also reduce local air pollutants, creating a co-benefit that strengthens the economic case for urban decarbonization.

Why Is Affordable Housing a Crisis in Urban Areas and What Works

Affordable housing is a crisis in urban areas because the cost of land, construction, and finance has risen far faster than wages in most major cities globally, making home ownership or adequate rental housing unaffordable for a growing share of the urban population. Evidence-based solutions include inclusionary zoning, social housing programs, transit-oriented development, and land value capture policies that fund affordable units from the gains generated by public infrastructure investment.

The housing affordability crisis has reached a tipping point in cities across every income level. In London, median house prices are 12 times median annual earnings. In Sydney, that ratio reaches 14 times. In Mumbai, Nairobi, and Lagos, informal settlements have grown because formal housing markets simply cannot produce units at price points accessible to workers in essential service jobs. Even in cities where wages are relatively high, housing cost burdens — defined as spending more than 30% of income on housing — affect over 40% of renters in many US cities (Harvard Joint Center for Housing Studies).

The consequences extend far beyond individual households. When essential workers — nurses, teachers, transit operators, sanitation workers — cannot afford to live near their workplaces, cities face labor shortages, longer commutes, higher absenteeism, and lower service quality. Housing unaffordability is also a major driver of homelessness, which has increased in virtually every major Western city over the past decade. The social and economic costs are enormous: a single homeless individual costs the public sector an estimated $35,000–$50,000 per year in emergency health and social services in the US context.

Interventions that have demonstrably improved housing affordability include:

• Vienna's social housing model: Vienna has maintained over 60% of its residents in subsidized or cost-controlled housing for nearly a century, through a combination of municipally owned housing (Gemeindebau) and limited-profit housing associations. The result is that median rents in Vienna are roughly half those in comparable European capitals.
• Singapore's Housing Development Board: Over 80% of Singapore's population lives in HDB flats — public housing built and managed by the government at subsidized prices. The program is widely credited with eliminating slums and providing stable, quality housing to all income levels.
• Inclusionary zoning: Policies requiring that a percentage (typically 10–20%) of units in new private developments be set aside at below-market rents or sale prices. Cities from New York to Barcelona to São Paulo use variations of this approach.
• Land value capture: Policies that recover a portion of the land value increase created by public investments (new transit lines, rezoning) and use those funds to build affordable housing — reducing the fiscal burden on general tax revenues.

The relationship between housing and transport is also critical. Mixed-use development that concentrates affordable housing near employment centers and transit hubs reduces the transportation burden on low-income households, which often spend 25–35% of their income on transport in addition to housing costs. Transit-oriented development (TOD) is increasingly recognized as the most effective urban planning approach for simultaneously addressing housing affordability and transport access.

What Role Does Public Transport Play in Sustainable Urban Development

Public transport is the circulatory system of a sustainable city. Efficient mass transit reduces per-capita vehicle emissions, lowers household transport costs, enables higher-density land use, reduces traffic congestion, and provides mobility access to people who cannot drive. Cities with high public transport mode shares — Tokyo, Hong Kong, Amsterdam, Zürich — consistently rank among the world's most livable, productive, and environmentally efficient urban environments.

The SDG 11 target on transport (11.2) calls for access to safe, affordable, accessible, and sustainable transport systems for all by 2030. The current gap is large: only 53% of urban residents globally have convenient access to public transport according to UN-Habitat's State of the World's Cities report. In Sub-Saharan African cities, coverage drops to below 30%. In these contexts, most trips are made on foot, by motorcycle taxi (boda-boda, okada), or by informal minibus — modes that are often unsafe, expensive, and polluting.

The hierarchy of urban transport interventions from most to least sustainable is:

1. Walking and cycling infrastructure — Zero emissions, physically beneficial, cheapest to build and maintain. Cities like Copenhagen (62% cycling modal share for commuting), Amsterdam, and Utrecht have demonstrated that bicycle-friendly design dramatically shifts modal shares when infrastructure is safe and continuous.
2. Bus Rapid Transit (BRT) — High-capacity buses on dedicated lanes approach metro-level capacity at a fraction of the cost. Curitiba, Brazil pioneered BRT in the 1970s; today 200+ cities have BRT systems. Bogotá's TransMilenio carries 2.5 million passengers per day.
3. Metro and light rail — High-capacity systems that reshape land use around stations, enabling transit-oriented development and reducing car dependence over decades.
4. Electric vehicles — Important for reducing vehicle emissions but do not address congestion, land use, or accessibility for non-drivers. Best understood as a complement to, not substitute for, mass transit.

The environmental dividend of public transport is substantial. A fully loaded metro train carries 1,500–2,000 passengers using the energy equivalent of roughly 25–30 cars. Cities with high transit ridership have per-capita transport emissions 3–4 times lower than car-dependent cities of similar size. The integration of transit planning with sustainable infrastructure development is essential to achieving SDG 11 transport targets.

Public transport is also a spatial justice issue. Low-income urban residents disproportionately depend on public transit because they cannot afford cars. When transit systems are underfunded, overcrowded, or unreliable, the burden falls heaviest on those who can least afford the time and cost of poor service. Investing in public transport is therefore inseparable from the goals of reducing inequalities within cities.

How Do Green Spaces Improve Urban Health and Resilience

Urban green spaces improve health and resilience through five mechanisms: reducing urban heat island temperatures by 1–5°C through evapotranspiration and shading; filtering air pollutants including PM2.5 and NO₂; managing stormwater by absorbing rainfall and reducing flood risk; providing physical and mental health benefits to residents, including reductions in stress, anxiety, and cardiovascular risk; and supporting urban biodiversity by providing habitat corridors between fragmented natural areas.

SDG 11 target 11.7 calls for universal access to safe, inclusive, and accessible green public spaces by 2030, with particular attention to women, children, older persons, and persons with disabilities. The WHO recommends a minimum of 9 m² of green space per urban resident. Many cities fall far short: Mumbai provides approximately 1.5 m² per resident, compared to 77 m² in Oslo. This disparity is not just an aesthetic issue — it has measurable public health consequences.

Research published in The Lancet found that residents living within 300 meters of green space have 18% lower mortality rates from cardiovascular disease than those without nearby greenery. A study of 31 European cities found that urban green spaces prevented over 43,000 premature deaths annually. During the COVID-19 pandemic, the lack of accessible green space in densely built informal settlements contributed significantly to mental health deterioration and limited safe outdoor exercise options.

The range of urban green infrastructure includes:

• Parks and gardens: Traditional neighborhood parks remain the foundation of urban green space provision. Singapore's "City in a Garden" vision, which mandates greenery on all new buildings and has created a network of park connectors, is among the world's most ambitious park systems.
• Green roofs and walls: Vegetated rooftop and facade systems provide cooling, stormwater retention, and partial habitat value in high-density areas where ground-level green space is scarce. Stuttgart, Germany has made green roofs mandatory on all new flat-roof buildings since 1995.
• Urban forests and street trees: Tree canopy cover is the single most cost-effective cooling intervention for urban heat islands. Cities like Melbourne, Australia target a 40% canopy cover by 2040 through strategic tree planting programs.
• Community gardens: Food-producing green spaces that deliver nutritional, social, and psychological benefits, particularly in food-insecure urban neighborhoods. See our dedicated guide to community gardens for implementation models.
• Riparian corridors: Restored urban rivers and streams provide flood mitigation, habitat, cooling, and recreation. Seoul's Cheonggyecheon stream restoration, which replaced a highway with a 5.8 km urban waterway, reduced summer temperatures in the surrounding area by up to 5.9°C.

Urban green spaces are also vital to managing the growing risk of urban flooding. As climate change intensifies rainfall events, cities with high impervious surface coverage face increasing flash flood risk. Green infrastructure — including rain gardens, bioswales, permeable pavements, and wetland restoration — can absorb and slow stormwater before it overwhelms drainage systems, significantly reducing flood damage and the associated health risks from sewage overflow.

What Are the Best Smart City Technologies for SDG 11

The smart city technologies most directly aligned with SDG 11 are those that improve efficiency and equity in housing, transport, energy, water, and waste management. The highest-impact applications include real-time public transport information systems that increase ridership, IoT-enabled water leak detection that reduces urban water loss (typically 20–40% of supply in aging networks), sensor-based air quality monitoring networks that enable targeted pollution interventions, and data platforms that identify underserved neighborhoods for prioritized service delivery.

Smart cities approaches have produced measurable SDG 11 outcomes in several areas:

Transport optimization: Cities like Singapore use dynamic road pricing and real-time traffic management to reduce congestion and shift commuters to public transit. Stockholm's congestion charging system reduced traffic by 20% and air pollution by 8–14% in the city center. Mobile apps integrating real-time transit data, ride-sharing, and cycling have made multimodal transport more accessible, particularly for residents in transit-poor areas.

Urban water management: Smart metering has helped cities like Phnom Penh, Cambodia reduce non-revenue water (water lost to leaks and theft) from over 70% to below 8% — freeing funds for service expansion to underserved areas. Leak detection using acoustic sensors and AI analysis can identify pipe failures before they become catastrophic. See our deep dive on water scarcity in urban contexts for more on the global stakes of this challenge.

Waste collection efficiency: Sensor-equipped bins that signal fill levels to collection teams have reduced waste collection vehicle-kilometers traveled by 30–60% in pilot cities, cutting both costs and emissions. The broader framework of circular economy principles applied at the city scale — designing urban metabolism to eliminate waste rather than manage it — offers transformative potential. Several cities, including Amsterdam, have formally adopted circular city strategies.

Building energy management: Smart building systems that optimize heating, cooling, and lighting based on occupancy and weather data can reduce commercial building energy consumption by 20–30%. When combined with net-zero building standards that mandate high insulation and renewable energy integration, smart buildings become net producers of energy rather than net consumers.

However, a critical caution about smart city technology: it must be deployed equitably to advance SDG 11. Technologies that primarily benefit wealthy residents in formal neighborhoods while leaving informal settlements and low-income areas digitally excluded will worsen urban inequality rather than reduce it. The SDG 11 framework explicitly requires that urban improvements be inclusive and accessible to all residents, not just those with smartphones, credit cards, or formal addresses. The deeper work of smart city development in 2026 increasingly focuses on this equity dimension.

Cities build disaster and climate resilience through a combination of risk-informed urban planning that avoids developing in high-hazard zones, early warning systems that provide life-saving lead time before floods and storms, resilient infrastructure standards that can withstand design events, social resilience programs that strengthen community networks, and post-disaster recovery frameworks that rebuild better rather than recreating pre-disaster vulnerabilities. The Sendai Framework for Disaster Risk Reduction (2015–2030) provides the international policy architecture for this work.

SDG 11 target 11.5 calls for a significant reduction in deaths and economic losses from disasters by 2030, with special attention to protecting the poor. The current trajectory is moving in the wrong direction: the UNDRR reports that economic losses from disasters have been increasing in real terms, driven by growing urban exposure in climate-vulnerable locations. Between 2000 and 2019, disasters affected 4.2 billion people globally (many repeatedly), with urban floods, tropical cyclones, and heat waves causing the majority of economic losses.

The cities most vulnerable to climate-related disaster risk include:

• Coastal megacities facing sea-level rise and storm surge (Mumbai, Dhaka, Ho Chi Minh City, Jakarta, Alexandria)
• River delta cities subject to compound flood risk from upstream rainfall and coastal back-pressure (Bangkok, New Orleans, Shanghai)
• High-altitude cities facing water scarcity as glaciers retreat (La Paz, Quito, Lima)
• Cities in wildfire-prone regions facing increasing fire weather conditions (Los Angeles, Sydney, Cape Town)
• Cities with large informal settlements on hillsides or floodplains where residents have no alternative to high-risk locations

Resilience-building strategies that have demonstrated effectiveness include:

• Early warning systems: Bangladesh's cyclone early warning system, developed after a 1991 cyclone killed 138,000 people, has reduced cyclone mortality by over 95% despite comparable or more severe storms in subsequent decades — a model now being replicated in other vulnerable nations.
• Nature-based flood defenses: Rotterdam, the Netherlands, has invested in "water squares" — public plazas that function as temporary water storage during heavy rain events — along with underground cisterns and widened canals, reducing flood damage while creating attractive public spaces.
• Seismic retrofitting: Japan's mandatory earthquake retrofitting program for older buildings has significantly reduced mortality in major earthquakes. Kobe's 1995 earthquake killed 6,434 people; the 2011 Tōhoku earthquake and tsunami, of far greater magnitude, killed 15,899 — most from the tsunami, not building collapse, due to decades of seismic upgrades.
• Community resilience networks: Programs like Japan's Neighborhood Disaster Prevention Organizations (Jishu-bosai) train local communities in first response, establish local emergency supply caches, and map vulnerable residents who will need assistance in emergencies. The community engagement dimension of disaster resilience is consistently undervalued relative to infrastructure investments.

Disaster resilience also requires addressing the social determinants of vulnerability. The same communities that face the greatest housing insecurity and environmental pollution — typically lower-income neighborhoods and informal settlements — also face the greatest disaster risk. A truly resilient city addresses these overlapping vulnerabilities together, not separately. This is the essence of SDG 11's integrated approach to building sustainable cities.

How Can You Help Build Sustainable Cities

Individuals can contribute to SDG 11 through choices that reduce personal environmental impact, political engagement that demands urban policy change, support for organizations doing urban sustainability work, and purchasing decisions that fund urban green initiatives. The most effective individual actions are those that combine personal impact with collective influence — using less, demanding more, and inspiring others to do the same.

Urban sustainability is not solely a government responsibility. The choices that millions of urban residents make every day — how they travel, what they consume, where they live, how they engage with local government — collectively determine the trajectory of cities. Here are the highest-leverage ways individuals can act:

Mobility choices:

• Choose walking, cycling, or public transit over driving for urban trips wherever feasible — the shift from car to transit or active transport is among the highest-impact individual actions for reducing urban emissions and congestion
• Advocate for cycling infrastructure, pedestrian safety improvements, and public transit funding in your city's budget processes
• If driving is necessary, consider electric vehicles — EV infrastructure expansion — and support policies that accelerate the transition

Housing and consumption:

• Reduce household waste and adopt zero waste lifestyle practices — the typical urban household generates 1.5–2 kg of solid waste per day, most of which can be reduced, reused, or recycled
• Compost organic waste to divert it from landfills and reduce methane emissions — organic material is typically 40–60% of urban household waste
• Support responsible consumption and production by choosing products with lower packaging, longer lifespans, and repair options
• Advocate for net-zero building standards in your city, and where possible, retrofit your own home with insulation, efficient appliances, and renewable energy

Green spaces and community:

• Participate in or support local community garden projects, tree planting initiatives, and park maintenance programs
• Engage with local planning processes — city thorough plans, zoning updates, transit corridor studies — where decisions about land use, density, and green space are made
• Support organizations working on affordable housing, slum upgrading, and urban resilience through volunteering and donations

Political and economic action:

• Vote for local officials with credible urban sustainability platforms — municipal government has more direct control over SDG 11 outcomes than national government in most countries
• Support businesses and brands with verified urban sustainability commitments, and use purchasing power to signal demand for sustainable urban products and services
• Engage with the broader SDG framework through the lens of partnerships for the goals, connecting urban sustainability work with international development efforts

The urgency of SDG 11 is hard to overstate. The cities being built today — from the megacities of Africa and Asia to the suburbs expanding across North America and Europe — will shape human quality of life and environmental outcomes for decades. Decisions made now about zoning, transport investment, building standards, and green space provision will lock in urban form for 50–100 years. Getting these decisions right, guided by the SDG 11 framework, is among the most consequential work of our era.

For a detailed view of how urban sustainability connects to the full spectrum of global goals — from ending poverty to making sure water and sanitation access to the sustainable development agenda as a whole — explore the full collection of SDG resources on the GGI blog. The challenge of sustainable cities is inseparable from the challenge of a sustainable world.