Syntropic Agriculture: the Regenerative Food-Growing Method that Could Reverse Climate Change and End Hunger

August 12, 2016
12 August 2016

"There is no such thing as a poor soil," stretches Ernst Götsch, a farmer and researcher who for the past 30 years has turned degraded land in Brazil into highly productive agroforests (trees and crops) using no chemical inputs, heavy machinery or irrigation. 

Since Götsch hardly publishes papers, I have traveled to Brazil to learn first hand how he manages to create net positive ecosystems, that produce food, while restoring soils and trapping outstanding amounts of carbon. As it happens, his method is nature-inspired, intuitive and easy to understand; it carries almost no cost and works in all ecosystems. If we were to leave it to nature to fix climate change and food security, this is how she would do it. 

Why does the subject matter    
Feeding the world releases 17,000 megatonnes of carbon dioxide into the atmosphere annually (source) - 47% of the total global emissions - and still leaves 795 million people - 10% of the global population - chronically malnourished. The Sustainable Development Goals 2, End Hunger, and 13, Climate Action, are an inspiring call on how we can help, yet a complete rethink on how we produce food is desperately needed. 

Another important aspect relates to how and where we will live in future. Despite projections that foresee 70% of the world population living in urban areas by 2050 (source), most likely the opposite scenario - a migration to the countryside - will be true considering the factors below.

Factors contributing to a new urban-to-rural migration trend | by Send a City
But we may also be pushed towards rural living, if the commitment to limit the temperature increase by 2100 to 2ºC adopted at the COP21 gets implemented. According to the Committee on Climate Change to achieve this goal the global emissions should peak at 2020 and be halved (or more) by 2050, which means per capita CO2 emissions in 2050 averaging around 2 tonnes. This is a reduction of 72% relative to today 7.3 t CO2e/capita. Mission (or rather emission) impossible unless we radically change the way we live.

According to a study from the Federal University of Ceará in Brazil, bigger cities produce more carbon dioxide per capita than small ones. "This shouldn't be a surprise," says the research team, "there are many aspects of cities that scale with population size, such as the number of jobs, houses and water consumption." 

In light of this, if we were to plan the most carbon-efficient community, it ought to be on the smaller size. But how dense should it be? Here is where agroforests enter the picture. 

If a community were to integrate an agroforestry system, it could offset part of their CO2 emissions with the CO2 sequestered by its plants. According to Cooperafloresta Brazil (see picture below) agroforests sequester approximately 10 tonnes of CO2 per hectare per year: 6.6 tCO2/ha/yr from the air and 3.5 tCO2/ha/yr through pruning. If the per capita emission today is 7,3 t CO2 and the number is smaller in smaller towns, we could assume a possible per capita CO2 emission in a small town of 4 tonnes. Since our emissions allowance will be 2 t CO2e/capita, we'd need to offset the other 2 tonnes. The 10 tCO2/ha/yr sequestered by an agroforest is equivalent to the CO2 produced by 5 people/ha (or 500 people/km2) at 2 t CO2e/capita. To conclude: a small town with a density of 500 people/km2 will meet the 2050 climate action targets by means of incorporating agroforestry, without their inhabitants having to shift customs or behaviour.

Needless to say, however, that the behavioural change will in any case occur through the practice of agroforestry: people would consume organic, locally produced food which will further reduce their carbon footprint (agroforestry produces 40 tonnes of food per hectare per year!). Agroforestry practised in small, sparsely-populated communities would be a way to meet the climate targets and could lead to carbon neutral (or carbon positive) living. 

This surely sounds like heresy to urban planners, since it looks like a return to "urban sprawl", the phenomenon we've been fighting for the past 25 years. But it won't be comparable since 1) the conditions are very different: people will work locally and/or remotely, consume less, travel less etc, 2) compact cities will still exist, and 3) "urban density" is like "fiscal austerity", in theory a good idea but in practice not really taking us where we want to be.

Carbon sequestration in agroforests | Study by Cooperafloresta
Syntropic agriculture and the work of Ernst Götsch
Ernst Götsch at 4th Workshop on Syntropic Agriculture | Photo Chris Lima
The eyeopener for Ernst Götsch (Switzerland 1948) was a trip to the tropics in 1976 when he was stunned by the contrast between the poverty of cultivated lands and the wealth of the bordering tropical rainforest (1). He found similar wealth resulting from the way small farmers worldwide had been practising agriculture for over thousand years. They would combine trees with crops and/or pastures (agroforestry) to achieve an increase in biodiversity and an improvement of soil fertility, thus leading to a higher productivity. Exactly the opposite than conventional agriculture achieves with monocultures and the use of herbicides, pesticides and mineral fertilisers.
Taking agroforestry as a base line, Götsch developed by means of trial and error a system called regenerative analog agroforestry, known in Brazil for its acronym SAFRA. This method works with processes rather than inputs and supplements agroforestry with strategic interventions (see below) and the natural succession of species in a system. This, according to Götsch, is what ultimately brings a system to thrive and not the initial quality of the soil or the amount of light it receives (2). He observed that the natural succession of species is one of the driving forces of life.

Götsch's research and work keeps unfolding and he now refers to it as syntropic agriculture since it actually follows the law of syntropy (3), also known as negative entropy, or the principles that sustain life. He also defines his work as "a way to create a positive energy balance in the world by means of unconditional love and cooperation."

His numbers are as impressive as his methodology. He produces in his farm in Bahia cacao beans so superior in quality, that they sell for four times the market price to Italian Amedei, the best chocolate producer in the world according to the London Academy of Chocolate, says an article in O Globo Rural this month (4). "The quality arrives with the ecological balance of the system", Götsch tells in the article. Since his method requires no inputs, Götsch produces his cacao at zero cost. He also achieves higher than average yields and his crops are unaffected by pests. 

His best numbers though are in his comparison of the energy efficiency of nature and technology:

Energy efficiency comparison of nature and tech | Photo by Chris Lima, edited by PS
"Nature uses for its metabolic processes approx 3% of its capital in order to achieve a 10 to 15% surplus." This means, nature (green line above) will always increase its energy (syntropy) since it produces more than it consumes. Technology on the contrary will always tend towards energy depletion since to achieve the same surplus of 10%, a combustion engine, for instance, burns between 70-75% of its fuel energy, that is, it consumes more than it produces and will always need energy added to its system (entropy). Technology will never lead to abundance, nature will.

Götsch's syntropic agriculture mimics nature: it produces its own fertiliser, creates abundant black soil and nutrients, retains water and optimizes its circulation. Notwithstanding the complexity of the system that requires in-depth knowledge of the local flora, Götsch believes that everyone can be a practitioner and encourages to focus on understanding the processes rather than on the details. His advice: to experiment with the species and to keep an open heart for new knowledge to flow in.

Syntropic agriculture practices

#1 Permanent soil cover
In agroforestry the ground is covered throughout with organic matter obtained from weeding, pruning and removing plants. This material placed on the ground as mulch (chipped or unprocessed) both enriches and protects the soil. "Efforts are made to recycle and to increase the amount of organic material produced by the plantation itself" (2) thus making away with the need for external fertilisers.  

An agroforestry site has on average 4kg of dry organic matter per m2, constantly decomposing. This equals to an estimated production of 6-10 kg of mulch /m2/yr with more than 3 to 5 prunings (5). The mulch fixes carbon dioxide to the ground, protects the soil from erosion and preserves water (some vegetable beds hadn't been watered for a month and a half).

Wood chip mulch and small tree branches for the vegetable beds. Hay mulch between them | Photo Chris Lima
Wood chip mulch decomposes in 6 months

Lettuce seedling planted  in wood chip mulch

Banana tree trunks cut in half over loose soil to avoid erosion and canalise water in slopes | Photo Chris Lima
Broccoli and lettuce seedlings planted in soil between banana trunks
Sloping vegetable beds made with banana and acacia mangium tree trunks are protected from erosion
#2 Pruning
The drastic trimming of branches and trunks done on a regular basis is an important part of syntropic agriculture. Besides producing the dead material for the permanent soil cover, strategic pruning rejuvenates maturing plants and accelerates the rate of growth in the whole system by increasing the amount of light and nutrients available to the future generations of plants. It also speeds and directs the organic process of (plants) succession. 

Through pruning the carbon trapped in the trees goes back to the soil. A mature agroforest (10-15 years old) has a carbon stock of 48 t/ha (source).

Acacia mangium pruning | Photo Chris Lima

Acacia mangium trunks and branches cut to equal size for vegetable beds | Photo Chris Lima
Smaller acacia mangium branches for vegetable beds borders | Photo Chris Lima

Acacia mangium trimmings and foliage used for mulch or processed for wood chip | Photo Chris Lima
#3 Companion planting
"Living beings of each place and in each situation form consortia in which each member contributes with its particular capacity to improve and to optimize its conditions as well as those of the members of its consortium to grow, prosper and reproduce." (2)

"It appears that the critical factor in determining health and growth rate of the plants, as well as the productivity rate of the system, is not the initial quality of the soil, but rather the composition and density of individuals of the plant community." (2)

Götsch creates consortia of crop species with synergetic potentials that cooperate with each other. Maize, for instance, produces more when planted with beans or grass (brachiaria brizantha); bananas grow healthier with orange trees, pineapple with manioc.

Despite the complexity of syntropic agriculture consortia, for the purpose of this workshop, we experimented with simple ones. We planted 3 to 5 crops, known to thrive together, like tomato, maize and green beans; maize, pumpkin and rucola; passion fruit, tomato, cucumber and chayote (chuchú).

Tomatoes, maize, banana growing together.
 3 tomato seeds, 2 green beans and 2 maize, each in a separate hole, are planted in a handful of soil between tree marigold stem cuttings

Sowing layout #1. The grass between beds (called "green" fertiliser) adds organic matter and nitrogen to the soil; it protects against pests, preserves humidity and decompacts the soil | Sketch by Send a City
Sowing layout #2 | Photo by Thiago Rips

#4 Adoption of successional elements

"Each consortium creates the conditions for a new consortium with a different composition. Hence, each consortium is determined by the preceding one and will determine the following one. The different consortia succeed one another in a dynamic, ongoing process called natural species succession." (2)

"The order in which crops are planted is important, as most species only grow vigorously if they enter the flow of species succession in such a way that they come to dominate and to thrive in the system." (1)  Equally critical for the establishment and development of a plant is the timing of when it appears.

Natural species succession in agroforests | Snapshot of video by Cooperafloresta
The sowing layout #1 (pictured above) paves the way for trees, in this case açai and cacao, to enter the system at a later stage. Tree marigold, a bush and a pioneer specie, is the first to grow (quickly and abundantly). In 6 to 8 months it will be drastically cut, its organic matter left on the floor. Same will happen with the banana trees and the vegetable plants after their harvest in the same period of time. The açai and cacao seeds will then be planted in lieu of the ginger. This secondary system is expected to grow beautifully.

40cm long tree marigold stem cuttings, 35cm apart, buried to 2/3

Tree marigold (margaridão) grown from stem cuttings in 6 months
The correct way to cut back a banana tree | Photo by Jenner Jon Lopes

There are many other strategies included in the practice of syntropic agriculture and some bombshells. "Eucalyptus promotes food production", says Götsch challenging the belief that it depletes the soil. "It produces gibberellic acid, which makes eucalyptus leafs a top quality mulch, and its roots bring water to the system rather than sequestering it." 

Pests are nonexistent in syntropic agriculture. Apparently pests go to weak plants and are therefore to be seen as an indicator of the plant's health rather than a threat. The way out is to address the plant's health by strengthening it. Pests then disappear naturally. Nothing to do though against birds eating crops. "That's life," says Götsch.

Syntropic agriculture works in temperate climates too. This is the way our ancestors did things. Just take apples for açai and start the journey.

4th Workshop on Syntropic Agriculture | Casimiro de Abreu, Rio de Janeiro 25-28 July 2016
Organized by Agenda Gotsch, a non-profit founded by journalists Felipe Pasini and Dayana Andrade to document and spread Ernst Götsch's work, through documentaries, workshops and social media
4th Workshop on Syntropic Agriculture | Photo by Thiago Rips

(1) Götsch, Ernst (1992) | Natural Succession of Species in Agroforestry and in Soil Recovery, Pirai do Norte BA, August 1992
(2) Götsch, Ernst (1994) | Breakthrough in Agriculture, Pirai do Norte BA, August 1994  
(3) Di Corpo, Ulisse (year unknown) | The Conflict Between Entropy and Syntropy: the Vital Needs Model
(4) Taguchi, Viviane (2016) | Agricultura Sintrópica, SP, August 2016 | Globo Rural #370: Editora Globo 
(5) Cooperafloresta (2016) | Pesquisas ajudam a comprovar benefícios das agroflorestas | Divulgador de Noticias, 6 Aug 2016
Articles on agroforestry
"A revolução na floresta" | Super Interessante, July 2016
"Life in syntropy: breaking the paradign of modern agriculture?" | Natural capital, 24 Feb 2016
"Ernst Gotsch e a agrofloresta: como produzir com a logica da abundância" | Namu, 08 March 2016
Further reading 
Di Corpo, Ulisse & Vannini, Antonella (2009) | An Introduction to Syntropy 
Di Corpo, Ulisse (2013) | Life Energy, Syntropy, Complementarity and Ressonance 
Ministério do Desenvolvimento Agrário (2008) | Manual Agroflorestal para a Mata Atlântica, Brasilia, Oct 2008 
Steenbock, Walter & Machado Vezzani, Fabiane (2013) | Agrofloresta: aprendendo a produzir com a natureza, Curitiba 2013
Vaz, Patricia (2000) | Regenerative Agroforestry in Brazil, Piracicaba SP, September 2000 | Ileia Newsletter: Ileia Foundation

Pictures by PS unless otherwise stated. Cover photo by Natureza Fotos

Venice Architecture Biennale 2016

May 31, 2016

Venice's 15th International Architecture Exhibition is mainly about mindful and sensible architecture. Curated by Pritzker laureate Alejandro Aravena, the exhibition wonderfully succeeds in reminding architects that the social good sector is exciting and worth the pursuit. It equally reminds commissioners that architects can make astounding contributions when it comes to shaping space and managing resources efficiently. 

The 2016 Biennale, titled REPORTING FROM THE FRONT, is a great attempt to engage everyone in the conversation on 'how to shape the places where we live'. While the show's focus is on projects that have addressed social, economic and environmental issues in a creative and bold manner, it also features projects of unusual beauty and interest. 

#1 Beauty and Sensuality
Wonderful the way Portuguese architect Aires Mateus explores space with light and shapes (picture above). His installation Fenda, which means slit, is a dark room where curvy section models carved in the walls are suggestively lit.  

Equality beautiful is Peter Zumthor's installation, a fragment from his future Los Angeles County Museum of Art (LACMA) filled with a colour gradation of fabric garment bags by designer Christina Kim. The project description reads: '...taking time as an antidote to homogeneity'. It refers to Zumthor's habit to spend more time than average in every project in order to achieve original work. Funnily enough, comedian John Cleese has exactly the same view on how to deliver original work.
Peter Zumthor and designer Christina Kim 

Sensuous is also how the Australian Pavilion feels. It pays tribute to Australia's pool culture by bringing in a shallow pool, some benches and the possibility to splash around and relax. 

The Pool, Australian Pavilion, by Aileen Sage Architects with Michelle Tabet

#2 Urban Planning
The German Pavilion explores the notion of Heimat and rethinks Germany as a welcoming nation for immigrants. Curated by the Deutsches Architekturmuseum (DAM) in collaboration with Doug Sanders, author of Arrival City, the exhibition identifies eight aspects key to an arrival city.
Making Heimat. Germany, Arrival Country (German Pavilion) by DAM with Something Fantastic

Very interesting the work of Raul Mehrotra and Felipe Vera on the increase and scale of what they call ephemeral urbanism. By this they mean temporary settlements like Kumbh Mela, the religious festival in India visited by 100 million people in 55 days. Or La Piste Camp in Haiti, where in 2010 the US military transformed what was once an airstrip into a temporary settlement for the victims of the flood.

Kumbh Mela tent city in India. 2,000 hectare. Photo: Felipe Vera

The Dutch Pavillion focuses on the legacy of peacekeeping missions and how these could become a catalyst for local development, moving away from being shut off from their direct surroundings and from making no contribution to improving the lives of the inhabitants of the region. 

Design for Legacy by the architecture think tank FAST suggests a four-step strategy to gradually open up these camps and share resources and knowledge with the local community. Step 1 would see the establishment of relationships while the camp is built. In step 2, the periphery of the base can be used as an interface with the local community either by providing there medical treatment or access to water, food and electricity. In step 3, when the political situation has stabilized, a shared space between the city and the base is created where the peacekeepers and the local community can develop projects together. Step 4 presents the post-mission model when the base is handed over to the local community.

 Camp Castor and other UN camps in Gao, Mali. Together they account for a third of the territory of the city. 

Setting up Camp Castor, Gao, Mali. Photo: Dutch Ministry of Defence

Four-step strategy to integrate a military compound to a city by FAST 

#3 Public Space
There were extraordinary examples of new and reclaimed public spaces. The city of Medellin in Colombia, for instance, has created new public spaces in the fenced and dark patches of land surrounding water and energy infrastructure. Through the UVA or Unidades de Vida Articulada (Units of Articulated Life) programme, the city has converted thirty-seven water tanks into 'socio-technical landscapes' while maintaining a fully functional infrastructural network.  The new public spaces are beautifully designed -some with plays of light and jets of water- and include auditoria and open air theatres, picnic areas and cafeterias, playgrounds and sport courts, even launderettes. In some neighbourhoods, the UVA interventions have provided the first and only public space available to the community.  

UVA Versalles, Medellin by EPM Group (public companies of Medellin). Photo: EPM
Architect Francis Kéré envisions a new square in Ouagadougou,  Burkina Faso, that includes the façade of the adjacent building to its public space. The new National Assembly, also by Kéré, is a massive stepped pyramid that people can climb to enjoy unique vistas over the town. The stepped façade allows views into the building and includes balconies for small-scale agriculture.

New Parliament Building in Ouagadougou, Burkina Faso by Kéré Architecture

A series of small light pavilions is what SANAA proposes to rescue a Japanese island from abandonment. Once a thriving island thanks to its stone and copper industries, Inujima is now home to an elderly population of just under 50 people. The idea is to turn the island into a creative platform -hosting art and performance workshops for both residents and temporary inhabitants- through small and modest interventions.
Unijima Island Landscape Project, Japan by Sanaa

How should new public squares in rural areas be like? According to the Norman Foster Foundation they should be multifunctional and provide the infrastructure that is missing in the area. Foster's Droneport project proposes a mini airport for drones cargo delivery in areas that lack of transport infrastructure. The buildings are a series of modular vaults made with earth based products by the local community and include a social hub, a clinic, a market and a post office.

Droneport in Rwanda by Foster & Partners

Prototype vault for the droneport by Foster and Partners

#4 Low-Cost Buildings
The Golden Lion for best pavilion has been awarded to Spain for the exhibition Unfinished. It shows the unusual architecture that has emerged in the country in the aftermath of the financial crisis. 

Spanish Dream 2011 by Colectivo Cadelas Verdes

Spanish Dream 2011 by Colectivo Cadelas Verdes

Casa Collage by Bosch Capdeferro Arquitectura

The studio ZAO/standardarchitecture from China has built a mock-up of the two small constructions they've designed for a courtyard refurbishment in BeijingThe constructions pick up the traditional add-on structures of the Hutong courtyards, the public space where families add their home extensions. The constructions are a 9m2 children library made of concrete mixed with Chinese ink and a 6m2 art space made with traditional bricks.

Children's library, Cha'er Hutong courtyard, Beijing by ZAO/standardarchitecture

Mini art space, Cha'er Hutong courtyard, Beijing by ZAO/standararchitecture

The Naga Site Museum, a building with no windows made of in-situ, compressed concrete made from local sands and aggregates. 
Naga Site Museum, Sudan by David Chipperfield Architects

Auburn University Rural Studio has created a space with materials that will later be donated to two Venitian charities: the Assamblea Sociale per la Casa and Cooperativa Caracol who, respectively, renovate vacant social housing and shelter homeless people. Rural Studio asked the local organisations what they needed and used part of what they requested to build the installation. 

The Theatre of the useFULL by Rural Studio

#5 Social Aspects 
The Polish Pavilion addresses with the exhibition Fair Building the ethical issues facing the most underrepresented participants in architecture: the construction workers. 'Labour conditions, lack of respect and site accidents plague the industry but these difficulties are often overlooked in favour of deadlines, budgets and the public demand for new spaces', states curator Dominika Janicka and asks whether a 'fair trade' mark is achievable in the industry.
Full-scale scaffolding structure for Fair Building. Photo: Polish Pavilion

Infographic showing the human cost of an average housing project, Fair Building, Polish Pavilion

Side notes offer extra information about accidents, migrant workers and unpaid overtime

Celebrating Our Human Footprint by Prof. Michael Braungart of EPEA advocates for building like trees, that is, to design buildings that clean water and the air, make oxygen, generate soil and nutrients. 
Celebrating Our Human Footprint by EPEA

Juntos, the exhibition at the Brazilian Pavilion, highlights stories of  change and architectural achievement. One of these stories is the Programa Vivenda, a Sao Paulo programme that helps low-income families with home refurbishments.

Programa Vivenda Sao Paulo

Rebootati, Uruguayan Pavilion

Reporting from the Front Biennale Architettura 2016 | Venice, 28 May - 27 November 2016

#inequality, #segregation, #peripheries, #migration, #informality, #sanitation, #waste, #pollution, #naturaldisasters, #housingshortage

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