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Tiny Homes to Meet Global Housing Crisis

By David SouthDevelopment Challenges, South-South Solutions

SOUTH-SOUTH CASE STUDY

More than 1 billion people around the world lack decent shelter. Of these, the majority live in urban areas, usually in slums and informal settlements (UN-HABITAT).

The world’s megacities – like Mumbai, India, where more than 22 million live in the metropolitan region – have to find a way to provide housing that is both affordable and does the minimum possible amount of harm to the environment.

About one-third of the world’s urban dwellers live in slums, and the United Nations estimates that the number of people living in such conditions will double by 2030 as a result of rapid urbanization in developing countries.

The fast pace of growth of India’s cities presents an enormous challenge: how to house so many people with dignity and to a good standard. India’s city slums are notorious and recently became the subject of the Oscar-winning film Slumdog Millionaire (http://www.slumdogmillionairemovie.co.uk/).

With a population of 1.2 billion, India needs to find 25 million homes a year to meet current demand, according to McKinsey and Co.

Housing prices have risen by 16 percent a year for the past four years. While the middle class – estimated at over 300 million people – has piled into high-end apartments and houses, it has been the country’s low-income people who have been frozen out of the option of quality homes.

The concept of targeting those at the ‘bottom of the pyramid’ (BOP) (http://en.wikipedia.org/wiki/The_Fortune_at_the_Bottom_of_the_Pyramid) has drawn attention to the estimated 23 million poor urban dwellers in India, and 180 million rural families, who have savings and want to own a home. Monitor India (http://www.monitor.com/in/) believes these people have annual earnings between US $1,400 and US $3,000.

The Indian manufacturing powerhouse Tata – which this year launched a BOP-focused car, the Tata Nano – has designed and is building, Nano Homes – small apartments outside Mumbai for US $8,600 (http://tatahousing.in/pages/home.php). It also hopes to expand to other major Indian cities as well.

The Nano homes are built on a modest scale: there are three sizes with the smallest measuring 67 square metres. They consist of a single room that doubles as a bedroom by night with a sink, bath and toilet behind a partition.

Criticisms include location – on the edges of major cities – where residents would have to commute long distances to get to their jobs.

Even so, Nano apartments are so popular buyers are being chosen by lottery.

“India’s housing crisis lies in the fact that the poor in the cities are priced out of the market,” Sundar Burra, an adviser to the Society for the Promotion of Area Resource Centre, a Mumbai-based housing rights organization, told Canada’s Globe and Mail newspaper.

“State supply of housing for the poor is woefully inadequate in relation to the need. Slums proliferate as a solution to this state of affairs.”

People can get a mortgage for the homes from Tata Home Finance.

Tata is not the only company targeting this market. India’s Matheran Realty (http://www.tmcity.in/) is building what it claim is India’s largest affordable housing project, Tanaji Malusare City, in the villages of Shirse and Akurle of Karjat (http://en.wikipedia.org/wiki/Karjat). The 15,000 homes would house 70,000 people and would sell for US $4,698.

Another developer, Godrej Properties (http://www.godrejproperties.com/), is building a BOP housing development outside the city of Ahmedabad with apartments costing US $11,749.

“(Property) developers have recognized that the real demand no longer lies in the premium segment and are opting to build smaller, no-frills apartments,” said Deepak Parekh of the Housing Development Finance Corporation (http://www.hdfcindia.com/).

It estimates the affordable housing market will be worth US$ 110 billion in India by 2013 and will account for 80 percent of India’s housing market.

“Affordable housing is not about box-sized, budget homes in far-flung places where there is no connectivity to workplaces and little surrounding infrastructure,” Parekh told HDFC’s shareholders. “Affordable housing has to be able to cut across all income segments and has to make economic sense in terms of proximity to the workplace.”

Published: November 2009

Resources

1) Building and Social Housing Foundation: BSHF is an independent organisation that works both in the UK and internationally to identify innovative housing solutions and to foster the exchange of information and good practice. Website: http://www.bshf.org/home.cfm

2) Tiny House Design Blog: The blog is full of ideas and plans for making small homes cheaply. Website: http://www.tinyhousedesign.com/

3) A blog detailing the Tata dwellings in diagrams and photographs. Website: http://www.tslr.net/2009/06/tatas-nano-homes.html

Development Challenges, South-South Solutions was launched as an e-newsletter in 2006 by UNDP’s South-South Cooperation Unit (now the United Nations Office for South-South Cooperation) based in New York, USA. It led on profiling the rise of the global South as an economic powerhouse and was one of the first regular publications to champion the global South’s innovators, entrepreneurs, and pioneers. It tracked the key trends that are now so profoundly reshaping how development is seen and done. This includes the rapid take-up of mobile phones and information technology in the global South (as profiled in the first issue of magazine Southern Innovator), the move to becoming a majority urban world, a growing global innovator culture, and the plethora of solutions being developed in the global South to tackle its problems and improve living conditions and boost human development. The success of the e-newsletter led to the launch of the magazine Southern Innovator. 

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This work is licensed under a
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ORCID iD: https://orcid.org/0000-0001-5311-1052.

© David South Consulting 2022

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Housing Innovation in South’s Urban Areas

By David SouthDevelopment Challenges, South-South Solutions

SOUTH-SOUTH CASE STUDY

As urban populations around the South increase, the quality of city housing will be critical to the quality of life and sustainability of improvements to living standards.

Living in crowded and chaotic urban and semi-urban areas does not have to mean suffering poor quality housing. A variety of Southern architects are showing how new perspectives on common problems like cramped spaces, traffic noise, minimal green spaces and tight budgets can be addressed with clever thinking and new concepts.

The bustling and crowded Brazilian city of Sao Paulo has evolved in a chaotic fashion over the years. As Brazilian photographer Reinaldo Coser admitted to design and architecture magazine Dwell (www.dwell.com) , in many places it is “very ugly.”

Sao Paulo suffers from the downside of rapid urban and semi-urban development familiar to cities across the South: traffic gridlock, pollution, noise. It’s a toxic combination of factors that turns even simple tasks like buying groceries into depressingly long, stressful ordeals.

Coser’s family home sits a couple hundred metres from the congested Avenida Brigadeiro Faria Lima (http://en.wikipedia.org/wiki/Avenida_Brigadeiro_Faria_Lima) , the city’s unofficial main street. Yet the dwelling has been cleverly designed to make living in the centre of this modern urban hurly burly a peaceful and calming oasis. Designed by Brazilian architects Studio MK27 (http://www.marciokogan.com.br) – and in keeping with the rich Brazilian modernist tradition pioneered by Oscar Niemeyer in the country’s capital, Brasilia (http://en.wikipedia.org/wiki/Bras%C3%ADlia) – the home uses clever techniques to build calm into chaos.

The front and back gardens are level with the living room, creating an enormous living space that seamlessly flows from indoor to outdoor space. By using a large overhang over the gardens, even on rainy days the home can be lived in almost without walls.

Furniture in the home draws on Brazilian designers like Sergio Rodrigues (http://www.sergiorodrigues.com.br).

One of several innovative Brazilian firms, Studio MK27 was founded in the 1980s by Marcio Kogan. It has 12 architects from around the world collaborating on projects.

With a metropolitan population of around 20 million, Sao Paulo (http://en.wikipedia.org/wiki/S%C3%A3o_Paulo) is the most populous city in the Americas, and in the Southern hemisphere.

While it is easy to point out the downsides of rapid and chaotic urban development, Coser, a professional photographer, lives and loves Sao Paulo nonetheless because, like so many cities across the South, it is a vibrant and dynamic place to be.

And by choosing a design for his home that is calming, he has been able to introduce balance into his family’s life while benefiting from the economic opportunities of the city.

“This house has actually changed the rhythm of our lives,” he told Dwell. “We eat at home more. We go to bed earlier. We wake up earlier. We sleep more.”

And how has the calm helped his two daughters? One is able to play without disturbing the neighbours, and the other can quietly study her books, which was difficult when the family lived in the noise and buzz of a small two-bedroom apartment.

And – something often overlooked in development plans cooked up by economists and urban planners – the aesthetics of the house are very appealing. “Our house is so pretty,” says his wife, Sophia. “Sometimes I like to just look at it for a long time.”

This calm home was created out of basic need. The family needed more space with a second daughter on the way, and had become frustrated with the congestion of the city and the lack of green space. Architect Marcio Kogan was consulted for a solution.

“We wanted a place where we could just shut the door and travel,” says Reinaldo.

The house is made from raw concrete and a cheap-but-tough local wood called cumaru (http://tinyurl.com/3y8kh8v) . By using inexpensive and low maintenance materials, the home is able to weather the environmental stresses of a polluted, tropical city with harsh sunshine.

Kogan deployed his previous experience as a filmmaker to make the home feel and look more spacious and open than it is. He calls it “looking at the world through a wide-screen lens.” The design of the home is seen as a “narrative”, leading the occupant from the garden to the living room, up the stairs, past bedrooms to a rooftop deck with panoramic views of the city.

Another innovative solution in Sao Paulo is USINA (http://www.usinactah.org.br) – a finalist for the World Habitat Awards (http://www.worldhabitatawards.org/about/?lang=00) – which brings people together to build high-density urban housing. It has aided more than 5,000 people to build with their own labour multi-storey buildings. These new apartments are not isolated from other services, but come with community facilities, childcare facilities, professional training courses and other employment-generating activities.

It is estimated up to 15 percent of the city’s population live in slums. This community organising approach is in contrast to the existing ad-hoc building of homes in the slums – often with no technical assistance – or public housing projects built by developers looking for quick profits while ignoring quality and services. USINA’s approach has led to Sao Paulo being a pioneer in participatory housing policies.

USINA provides the technical assistance to social movements looking to build housing for the poor. The cost for the buildings is borne by a combination of public funding and the labour of the residents (working 16 hours per week per household). The cost per housing unit tends to be between US $12,000 and US $15,000 (with land usually donated free by public authorities).

Architectural innovation is also underway in Indonesia, another country that has experienced spurts of rapid economic growth and urbanization, and where a growing middle class is demanding a higher quality of life.

The country’s capital, Jakarta (http://en.wikipedia.org/wiki/Jakarta) , with a population over 8 million, is a mixed bag of modern skyscrapers, crumbling colonial architecture, suburbs and slums.

In the Jakarta suburb of Bekasi (population more than 2 million), Nugrohu Wisnu was looking for a little more space for his family.

At first, the family encountered the downside of poorly designed housing. They bought a house which was infested with termites and was uncomfortable to live in. Frustrated, they began shopping around for something better. And they turned to Indonesian architects Djuhara + Djuhara (http://djuhara.com/home.html).

“We thought that an all-steel house like the one that Mr. Djuhara had built just down the road would be termite resistant,” Wisnu told Dwell.

Djuhara is a high-profile architect and chair of the Jakarta chapter of the Indonesian Institute of Architects (http://www.iai.or.id) and helped to modernize the city’s planning regulations.

The stereotype of young Indonesian architects is that they only work on luxury hotels. But Djuhara was designing and building suburban homes and this grabbed Wisnu’s attention.

Also against stereotype, Djuhara was actually attracted by a tight budget and the small space for the house. In a crowded city, using every bit of space efficiently is critical. The existing house was torn down and Djuhara set about building a new home. The majority of the building materials were sourced within the immediate area: an easy thing to do in Jakarta since there are many vendors selling building supplies on the streets.

By buying local like this, shipping costs were eliminated from the cost of the house. The home’s cost, US $20,000, is just 2/3 of what a more conventional Indonesian home would cost.

Djuhara revelled in the job: “Ad-hocism is my religion,” he told Dwell.

The split-level design of the home uses the space well. The kitchen opens up into the garden.

“Family breakfasts are great in here,” says Wisnu. “And the open kitchen encourages the kids to head out into the garden and run and play.”

There is also a strong environmental component to the design. Airflow cavities in the ceiling are used in the bedrooms to cool them. The house also uses heavy wooden shutters to keep the house cool during the day: “The shutters are unusual, but they are thick and sturdy,” Wisnu explains.

“They really shade the master bedroom to the extent that it feels mellow and cool. They let us reduce our air-conditioning consumption, even during the height of the day.”

And Djuhara also has another difference from many other architects: he refuses to patent his design.

“My friends have asked me why I don’t patent my low-cost houses,” he explains, “but they completely miss the point. I actually want my designs to be copied. I want Indonesian society to rethink its attitudes towards urban architecture.”

Published: June 2010

Resources

Development Challenges, South-South Solutions was launched as an e-newsletter in 2006 by UNDP’s South-South Cooperation Unit (now the United Nations Office for South-South Cooperation) based in New York, USA. It led on profiling the rise of the global South as an economic powerhouse and was one of the first regular publications to champion the global South’s innovators, entrepreneurs, and pioneers. It tracked the key trends that are now so profoundly reshaping how development is seen and done. This includes the rapid take-up of mobile phones and information technology in the global South (as profiled in the first issue of magazine Southern Innovator), the move to becoming a majority urban world, a growing global innovator culture, and the plethora of solutions being developed in the global South to tackle its problems and improve living conditions and boost human development. The success of the e-newsletter led to the launch of the magazine Southern Innovator. 

Creative Commons License

This work is licensed under a
Creative Commons Attribution-Noncommercial-No Derivative Works 3.0 License.

ORCID iD: https://orcid.org/0000-0001-5311-1052.

© David South Consulting 2022

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Brazilian Design For New Urban, Middle-Class World

By David SouthDevelopment Challenges, South-South Solutions

SOUTH-SOUTH CASE STUDY

Countries across the global South are experiencing rapid urbanization as people move to cities for better economic opportunities — and this massive social change is creating new business opportunities. Those who recognize how fundamentally people’s lifestyles are changing will be those who will benefit from this big shift in populations.

Finding ways to live well in urban areas will be critical to determining whether this move repeats past urban failures — from the favelas of Brazil to the slums of India — or introduces a new way of living that is exciting and colorful. Design and designers will be critical to this change.

One young design company in Brazil, Sao Paulo-based furniture studio NUUN  (nuun.nu), is attempting to resolve a dilemma common across the rapidly urbanizing global South: How to create a design aesthetic that fits with the new way of living and being?

The company consists of designer and founder João Eulálio Kaarah and architects Renato Périgo and Carolina Sverner.

Périgo specializes in furniture and interior design, while Carolina Sverner worked with respected Japanese architect, Shigeru Ban (shigerubanarchitects.com), who is well known for designing buildings and houses made from paper and for creating easy-to-build homes for people after a disaster has struck (http://www.ted.com/talks/shigeru_ban_emergency_shelters_made_from_paper).

A collaboration among upcoming artists, designers and architects, NUUN tries to infuse its designs with a sense of “brazilianness”. Brazilianness is a modern aesthetic, made for modern lifestyles in the new urban landscape, that draws on aspects of Brazil’s culture and environment.

The young studio’s first collection of furniture offers simplicity. Called Eos, it tries to blend urban cosmopolitanism with raw nature. Brazil is known for its jam-packed urban cities as well as its vast expanse of Amazon rainforest. In practice, NUUN’s look is a mix of contrasts redolent of what used to be called brutalism: concrete mixed with glass, steel, wood and semi-precious gems. NUUN takes inspiration from NASA’s Earth Observation System (EOS): the collection vibes off of space satellites, antennae and the dry soil of the backwoods. NUUN says that “despite its Martian features, [the collection] is as Brazilian as it comes”. There is the modular Panorama sofa (http://nuun.nu/products/panorama) in five colors, capable of being re-shaped to fit a variety of living arrangements. A glass-topped coffee table with a concrete base and a side table with a carbon steel metallic structure to complement the sofa.

Elsewhere in the world of Brazilian design, footwear brand Grendene S.A. (http://ri.grendene.com.br/EN/Company/Profile) has become one of the world’s largest producers of footwear and made one of its founders a billionaire. And Grendene has boosted its international success by turning to another Brazilian success: supermodel Gisele Bündchen (giselebündchen.com.br).

Grendene began in 1971 and owns various successful shoe brands, including Melissa (melissa.com.br/en/), Grendha, Ilhabela, Zaxy, Cartago, Ipanema, Pega Forte, Grendene Kids and Grendene Baby.

It has six industrial zones with 13 footwear factories and can produce 240 million pairs of shoes a year. It undertakes all areas of production— from making its own moulds for the shoes to creating PVC (polyvinyl chloride) (http://en.wikipedia.org/wiki/Polyvinyl_chloride) – and handles its own distribution.

While Grendene is already a well-known shoe brand in Brazil, it wanted to expand its presence overseas to increase profits. Named after the two brothers who founded the company, Alexandre Grendene Bartelle and Pedro Grendene Bartelle, Grendene started working with supermodel Gisele Bündchen in 2002 to help her launch her own line of affordable flip-flops, iPanema (ipanemaflipflops.co.uk). The brightly colored sandals with elaborate patterns became an instant success.

But do celebrity endorsements really work? In the case of Bündchen and Grendene, the answer is yes. According to Forbes, 25 million pairs of the flip-flops and sandals are sold every year, accounting for 60 per cent of Grendene’s annual exports of about US $250 million.

Brazil was able to produce 864 million pairs of shoes in 2012, up 5.5 per cent from 2011.

Of these, 113 million pairs were exported to the United States, Argentina and France.

Brazil, like many other countries, has had to work out how it could compete with cheaper shoe imports from China. The strategy it chose was to target the growing number of middle-class people both in Brazil and elsewhere, as well as the high end of the market.

In 1979, Grendene created the Melissa brand, which has now become a coveted style leader. It collaborates with top design names such as Karl Lagerfeld and architect Zaha Hadid.

Making a partnership with Bündchen is part of the company’s strategy to reach higher-income buyers.

And it is working: Grendene increased its export revenue by 50 per cent in 2013.

Co-founder Alexandre Grendene Bartelle became a billionaire according to Forbes World’s Billionaires list and is worth US $1.4 billion. He owns 41 per cent of Grendene S.A. and close to 40 per cent of the Dell Anno brand.

This is a critical lesson for manufacturers in the global South. Grendene had achieved strong market dominance at home, and was already benefiting from growing wealth among Brazil’s middle classes. But it was the overseas market that had the potential to clinch even more profits for the company.

Bündchen’s high brand profile has enabled the company to compete head-to-head with the well-known Brazilian flip-flop brand, Havaianas (havaianas-store.com).

Another modern design leader owned by Grendene, Dell Anno (lojasdellanno.com.br), is a maker of modernist cabinets and furniture.

Dell Anno only use wood from renewable forest sources, to protect and preserve the Amazon and other native forests. Dell Anno tries to recycle as much as possible: up to 80 per cent of the water used in manufacturing is recycled, and byproducts from the production process such as a sawdust, wood, plastic and cardboard are also reused.

Dell Anno makes a full range of furniture for kitchens, bedrooms, closets, home theatres, home offices, service areas, restrooms and commercial environments. Dell Anno uses research and development to study trends and advise customers on the best options. The brand offers its staff training to help standardize customer service, and also has an excellent blog covering developments in modern design around the world (http://www.lojasdellanno.com.br/blog/).

Published: May 2014

Development Challenges, South-South Solutions was launched as an e-newsletter in 2006 by UNDP’s South-South Cooperation Unit (now the United Nations Office for South-South Cooperation) based in New York, USA. It led on profiling the rise of the global South as an economic powerhouse and was one of the first regular publications to champion the global South’s innovators, entrepreneurs, and pioneers. It tracked the key trends that are now so profoundly reshaping how development is seen and done. This includes the rapid take-up of mobile phones and information technology in the global South (as profiled in the first issue of magazine Southern Innovator), the move to becoming a majority urban world, a growing global innovator culture, and the plethora of solutions being developed in the global South to tackle its problems and improve living conditions and boost human development. The success of the e-newsletter led to the launch of the magazine Southern Innovator.  

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Rammed-Earth Houses: China Shows how to Improve and Respect Traditional Homes

By David SouthDevelopment Challenges, South-South Solutions

(Havana, Cuba), November 2008

SOUTH-SOUTH CASE STUDY

The pace of change across the South has been blistering. Over the past decade, the overall population has moved from being primarily rural to majority urban. In the process, rural communities have suffered, as they have seen their young and ambitious leave in droves seeking a better life in cities.

More than 200 million Chinese farmers have moved to cities in recent years. It’s easy to see why. Chinese farms are tiny, with the average rural household farming just 0.6 hectares. And incomes are low compared to the cost of living: average annual income was just US$606 in 2007, a third of city salaries.

But it is possible to improve the quality of life in rural areas and in turn boost economic fortunes.

In China, projects that upgrade homes to modern standards while respecting traditional designs and architecture are breathing new life into rural communities. A return to the age-old technique of using earth as the principal building material is saving energy and keeping house costs low.

The tradition of packing earth to build a wall dates back to some of the earliest stretches of the Great Wall of China in 220 BC.

Currently it is estimated that half the world’s population-approximately 3 billion people on six continents – lives or works in buildings constructed of earth.

This traditional building technique is being used in the reconstruction effort to build new homes after the May 12, 2008 earthquake in Sichuan Province. The earthquake left millions of people homeless in the country’s worst natural disaster in 30 years, and has made low-cost but efficient house building critical.

In western China, villages have been entirely rebuilt from scratch. The application of research and science to the traditional designs – roofs in the pagoda style, with buildings arranged around courtyards – enabled the development of homes that are energy efficient to run, and are more hygienic and earthquake safe. In Yongren County of Yunnan Province, over 7,000 mountain dwellers were moved to better farming land and over 2,000 homes were built in the new village of BaLaWu. Over 30 of the homes were built using rammed earth by the Xi-an team. 

“The original homes had very low living quality,” said team member Hu Rong Rong of the Green Building Research Centre of Xi’an University of Architecture and Technology (http://www.xauat.edu.cn/jdeg/about.html), which oversees building of the new homes. “The architecture layout of the indoor space and courtyard was not reasonable. In the courtyard the areas for living, raising livestock, storing and processing crops were mixed up. The indoor environment was not comfortable. It was cold in the houses during winter and hot during summer. Most of the rooms lacked natural lighting and were dark in the daytime.

“In the poor areas, many people still live in earth houses because of the low cost. However, most of the earth houses have low living quality.

“After we finished the project, through our design, the living quality was improved very much. The dwellers were satisfied with their new houses.”

Land reform in China has brought more hope to the country’s 750 million rural poor, many of whom live on less than US$1 a day. It is hoped that giving the rural poor more control over their lives will bring an improvement in agricultural production, food security and economic prosperity. Reforms also mean the poor have more secure land rights.

Hu said gaining the trust and buy-in of the villagers was critical to the success of the project.

“We built the first home as a demonstration. After we finished, the villagers could experience the advantages of the new home. Most of them decided to use our design and they could choose the one they liked from several proposals.”

Poverty is a big problem in the villages. Incomes are very low, at 2000 RMB per year (US $290). Hu said “families were given a house-building allowance of 8000 RMB (US $1,160) to meet the cost of building materials – and the land was free for them to use.”

“The villagers built the houses by self-help. We helped them to design and build the houses for free,” Hu said.

The houses are pioneering in using natural sources to provide light, heat, waste disposal and gas for cooking and heating.

“We used natural material like earth as a main building material to get good thermal mass and also to reduce CO2 emission,” Hu said.

“We designed a simple family sewage-purge-pool and marsh-gas-well system to reduce pollution and get energy from wastes.”

Using rammed earth has a long history in China. Across Western China, there are many buildings constructed with rammed earth. And using earth has many advantages when resources are scarce or expensive: “Earth buildings avoid deforestation and pollution, and can achieve low energy costs throughout their lifetime,” said Hu.

“With living standards increasing, more and more people would like to use burned bricks and concrete to build new houses, which will consume more energy and bring pollution,” said Hu.

But like any technology, the application of modern science and environmental knowledge to the traditional designs, can reap huge improvements in the quality of the homes and comfort levels. And win people back to the benefits of rammed earth dwellings.

“Building with earth materials can be a way of helping with sustainable management of the earth’s resources,” said Hu.

And Hu is adamant the new, environmentally designed homes respect the wisdom of traditional design.

“The new earth house design should consider the local culture. It should be proved that both the house style and the construction technique can be accepted by the users.”

Published: December 2008

Resources

  • The Rural Development Institute focuses on land rights for the poor and has a series of articles on China’s land reforms. Website: www.rdiland.org
  • Rural DeveIopment Institute has recently been given an award from the World Bank’s Development Marketplace competition to create Legal Aid and Education Centres in China’s countryside. Website:www.rdiland.org/PDF/092808_WorldBankComp.pdf
  • A blog gives more details on the Chinese rammed earth project. 
    Website:www.51xuewen.com
  • Earth Architecture, a book and blog on the practice of building with earth, including contemporary designs and projects. 
    Website: www.eartharchitecture.org

Sponsored by BSHF. BSHF is now called World Habitat and it aims to seek out and share the best solutions to housing problems from around the world.

Creative Commons License

This work is licensed under a
Creative Commons Attribution-Noncommercial-No Derivative Works 3.0 License.

ORCID iD: https://orcid.org/0000-0001-5311-1052.

© David South Consulting 2021