The world is urbanizing fast—200,000 people are moving to cities every day in search of homes, jobs, as well as education and healthcare services for their families. Supporting this influx with proper infrastructure and services for water, sanitation, transport, and green spaces will require an estimated $1 trillion each year.
Given the difficulties of further increasing the tax burden or the level of public debt,
Not willing to wait for their national governments to bless them with scarce infrastructure funds, innovative mayors have figured out .
Building healthy and well-functioning cities and communities that continue to thrive for generations is the goal of the Global Platform for Sustainable Cities (GPSC), a collaboration that unites cities across continents in their endeavors towards achieving sustainable, resilient development.
What would these cities and communities look like to you? The GPSC, its partner cities, and the Global Environment Facility (GEF) invite you to articulate sustainability through the medium of photography.
Whether it be elements of your city that represent sustainability, or a moment in time that captures the spirit of inclusive, resilient, and sustainable urban development, we invite you to share your vision with us, through your photographs.
The winners of the photo competition will each win exciting prizes: a $500 voucher for purchasing photography equipment, as well as a chance to be recognized at an award ceremony and have their photographs featured in the World Bank / GPSC’s online and print materials.
Here’s how the Sustainable Cities Photo Contest will work:
What are Chongqing's plans? How will they affect the lives of the city's residents? Watch a video as World Bank Senior Director Ede Ijjasz-Vasquez (@Ede_WBG) and Deputy Director Zhou Tao from the Chongqing Municipal Development and Reform Commission discuss urban regeneration.
- Feature story: In Search for New Drivers of Growth, China Goes from Expanding to Revitalizing Urban Areas
- Report: Regenerating Urban Land: A Practitioner's Guide to Leveraging Private Investment
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When a family of 10 smooth-coated otters appeared in Singapore’s urban downtown of Marina Bay last year, the city was ablaze with excitement and delight. Who would have thought that these otters would make a dense urban environment like Singapore home? After all, otters were thought to have vanished in the 1970s as Singapore rapidly developed into a dense metropolis.
Was this a fad? Probably. Was this a big deal? Absolutely. In a small city-state where land is considered a scarce resource, This was not the case in Singapore. Between 1986 and 2010, as Singapore’s urban population doubled from 2.7 to 5 million, its green cover also increased from 36% to 50%, all within the confines of just 710 square kilometers. The increase in green cover in urbanized Singapore was seen as a sign that the efforts by the urban planning agency, parks and water management boards had paid off, and a testament that the natural environment could be indeed be integrated effectively into the urban fabric of the city.
Today is World Environment Day. This year, it celebrates the theme of “connecting people to nature,” and invites us to think about how we are part of nature—and how intimately we depend on it.
- New Urban Agenda
- Global Goals
- sustainable development goals
- public space
- urban design
- urban planning
- Sustainable Communities
- Urban Development
- Climate Change
- East Asia and Pacific
- World Environment Day
My previous blog post surveyed some of the recent trends in developing global measures of urbanization. In this post, I want to turn to a brief discussion for scholars and practitioners on some possible applications and areas of focus for ongoing work:
[Download draft paper "Bright Lights, Big Cities: a Review of Research and Findings on Global Urban Expansion"]
While there are a number of different maps for documenting urban expansion, each has different strengths and weaknesses in application. Coarser resolution maps such as MODIS can be used for mapping the basic contours of artificial built-up areas in regional and comparative scales. On the other hand, high-resolution maps are best suited for individual cities, as algorithms can be used to identify and classify observed colors, textures, shading, and patterns into different types of land uses. These levels of detail are difficult to use for reliable comparisons between cities as the types of building materials, structure shapes, light reflectivity, and other factors can vary widely between countries and regions.
Nonetheless, there are a number of applications for policymakers in this regard, from identifying and mapping green spaces and natural hazard risks to identifying and tracking areas of new growth, such as informal settlements. However, such approaches to land use detection require careful calibration of these automated methods, such as cross referencing with other available maps, or by “ground truthing” with a sample of street-level photos of various types of buildings and land cover as reference inputs for automation. One solution to this is the use of social media and geo-coded data to confirm and monitor changes in urban environments alongside the use of high-resolution satellite imagery.
Nighttime light maps also have gained traction as measures of urban extent and as ways to gauge changes in economic activity in large urban centers. They are probably less useful for documenting smaller settlements, which may be dimmer or have little significant variation in brightness. It is important to correct these types of maps for “overglow” measurement effects—where certain light may “bleed” or obscure the shapes and forms of very large, bright urban areas in relation to adjacent smaller and dimmer settlements (newer VIIRs maps have made some important advances in correcting this).
(land surface coverage comprised of buildings and roads) and population growth across time and space. This impacts how policymakers may understand and prioritize the challenges cities face and what investments or reforms may be needed. In a new paper, “Bright Lights, Big Cities: a Review of Research and Findings on Global Urban Expansion,” I provide a brief introduction to some of the current approaches for measuring urban expansion and review the comparative findings of some recent studies.
The UN’s World Urbanization Prospects (WUP), perhaps the most comprehensive and widely cited measure of urbanization across the world, draws from a compilation of country-level population totals based on administrative definitions. A key weakness with this set is that since each country defines “urban” differently, it is difficult to accurately compare one country’s urbanization to another, as well as to estimate the urban population of a group of countries or the world itself. Recent work has provided more sophisticated ways to measure urban growth and expansion using both satellite map data and careful application of population data.
Last November, 345 “Zika Warriors” took to the streets of Jamaica to fight the spread of the Zika virus in 30 communities. These local residents trained as vector control aides to prevent Zika primarily by improving waste management in their communities, including cleaning up public spaces and destroying mosquito breeding sites. In addition, they distributed bed nets to pregnant households.
As we observe World Health Day today, we look back with great thanks to the significant reduction in Zika in these communities. Anecdotal evidence suggested that the Zika Warriors significantly stemmed the spread of the virus, especially compared to the 2014 Chikungunya outbreak that led Jamaica to declare a state of emergency.
As a first responder to the pandemic, the Jamaica Social Investment Fund (JSIF) designed this program within an existing waste management program of the World Bank’s Integrated Community Development Project, directly benefitting more than 140,000 citizens.
We may not know exactly what the world will look like in two decades, but we know this: it is going to be a world of cities.
Each year, urban areas are growing by an average of more than 75 million people – more than the population of the world’s 85 smallest countries combined.
For the world’s economy, this is great news, since cities produce 80 percent of global GDP, despite currently being home to only 55 percent of the population. But it is a problem for urban infrastructure, which can’t keep up with such fast-paced growth. As a result, – from flooding and landslides that can decimate informal housing settlements, to earthquakes that can devastate power grids and water systems.
These risks could be disastrous for the urban poor, 881 million of whom currently live in slums (up 28 percent since 2000). And climate change – which is increasing the intensity and frequency of natural disasters – will only exacerbate the problem. For this reason, multilateral and government institutions now see resilience and climate adaptation as integral pillars of development.
The Swiss State Secretariat for Economic Affairs (SECO), for example, considers low-emission and climate-resilient economies to be key to global competitiveness. A recent report by the World Bank and the Global Facility for Disaster Reduction and Recovery (GFDRR) found that climate change may force up to 77 million urban residents into poverty by 2030 – unless we take action to improve the resilience of cities around the world.
These metropolitan areas face a common challenge: effectively coordinating planning, infrastructure development, and service delivery across multiple jurisdictions. This is particularly difficult in developing countries, which often lack the necessary legal, institutional, and governance apparatus to undertake such coordination. The New Urban Agenda issued by the Habitat III conference in 2016 identified
Fortunately, To help spread existing good practice and co-create new solutions, the World Bank has been supporting a community of practice (CoP) on metropolitan governance, or MetroLab, which brings together officials from metropolitan areas in both developing and developed countries for peer-peer knowledge and experience sharing. Since its launch in 2013, MetroLab has held eight meetings in various cities, including Bangkok, Mumbai, New York, Paris, Rio de Janeiro, and Seoul.
The most recent meeting took place in Tokyo from January 30 through February 2. Organized by the World Bank’s Tokyo Development Learning Center, the Tokyo MetroLab brought together mayors, city planners, and finance officials from nine developing cities. They were joined by experts from the World Bank, New York’s Regional Plan Association, the Seoul Metropolitan Government, and Advancity—Paris’ Smart Metropolis Hub.
In this video, Lydia Sackey-Addy, one of the participating officials from Accra, Ghana, as well as the World Bank’s Senior Director Ede Ijjasz-Vasquez (@Ede_WBG) and Lead Urban Economist Maria Angelica Sotomayor (@masotomayor) tell us how they are working together to make the Accra metropolitan area more resilient and sustainable for its residents.
Despite many advantages including an ambitious program for devolution, the challenges for a smooth urbanization process remain multifaceted for Kenya:
- Access to services remains low;
- Informality of human settlements and jobs predominate; and
- Poorly functioning land markets make investing in housing and infrastructure expensive and inefficient.
In this video, Senior Director Ede Ijjasz-Vasquez weighs in on Kenya’s urbanization challenges, focusing on urban finance, land and planning institutions, and urban governance, as he discusses the main messages of the Kenya Urbanization Review.
Video: Courtesy of Arimus Media