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Circle Economy and ICLEI have partnered up to initiate the go to knowledge hub of case studies about the circular economy in cities. The Cities Collection is a repository of case studies that demonstrate the role of cities in the circular transition, and includes policies, business cases and research articles. Cases in the Collection flow into an ecosystem of digital products which support users in transitioning cities to circularity, for example [Ganbatte](https://ganbatte.world/cities/) and <a href="https://circulars.iclei.org/" target="_blank">ICLEI Circulars</a>, both part of the <a href="https://circulars.iclei.org/circle-lab-for-cities/" target = _blank">Circle Lab for Cities Programme.</a>




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Circular Cities

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Policy case

Impact on the availability of resources as well as their effect on living organisms, ecosystems, and components of the environment.

Ecological Impact

Impacts on the social fabric of the community and well-being of the individuals and families.

Social Impact

Impacts on the financial condition of a company, as well as the the economicconditions of its stakeholders and on economic systems at local, national, andglobal levels.

Economic Impact

Impact on increased knowledge and understanding as a result of the case study

Increase Awareness

Impact on the quantity or quality of jobs, and shifts in the labour market

Jobs

Impact on the health and happiness of human populations

Well-being

Direct and indirect reduction in economic costs

Cost Savings

Direct and indirect effects that increase revenues or the potential for new revenues, for example from new products, customer segments, partnerships or business models

Revenue Potential

Efficiency gains on operations or transactions either through cultural or technological shifts

Productivity

Impact on the ease of innovation, and facilitating uptake of innovations

Innovation

Scalability

Reduced green house gas emissions released into the biosphere

Reduce Emissions (SDG13)

Reduced use and withdrawal of water and rate of recycling and reuse of water

Save Water (SDG6)

Reduced use of fossil fuel energy sources and/or increased use of renewable energy

Reduce Energy Consumption

Contributing to the improvement of biodiversity including species diversity, total number of protected species, and ecosystem health

Biodiversity

Producing agricultural products and processing them into food and beverageproducts for consumption

Agri/Food

Societal Services

Providing public and private education and support services at any level or for any profession, and governmental and public administration services, including judicial, regulatory, and legislative activities, taxation, defence, public order and safety, immigration services, foreign affairs and the administration of government programmes

Education and Government Services

Producing and gathering crop and animal products from land and water through farming, hunting, and fishing

Agriculture

Ensure renewable, reusable, non-toxic resources are utilised as materials and energy in an efficient way

Prioritise regenerative resources

Account for the systems perspective during the design process, to use the right materials, to design for appropriate lifetime and to design for extended future use

Design for the future

Work together throughout the supply chain, internally within organisations and with the public sector and communities to increase transparency and create joint value

Team up to create joint value

Replace freshwater with less impactful alternatives and enact water efficiency measures

Regenerative water

Replace energy sources with less impactful alternatives and enact energy efficiency measures

Regenerative energy

Designing products that are made to last and to ensure longer use

Design for durability

Engage with the government on circular policies and programmes

Government collaboration

Enacting measures that optimise water use

Water efficiency

Enacting measures that optimise energy use

Energy efficiency

Designing products to resist damage and wear, and serve a long and useful life.

Design for physical durability

Participating in government programmes that support and advance the circular economy

Government programmes

'Inform' increases the overall levels of awareness and builds the necessary skills and knowledge around the circular economy to foster long-term change.

Inform

Extra-curricular education

Implement innovation programmes

'Manage' influences the use and function of physical and material elements within the urban environment. 

Manage

Infrastructure

Develop infrastructure to support sustainable lifestyles

'Mobilise' sets the direction of and builds momentum towards long-term change, while also determining how this direction is determined and governed.

Mobilise

Visions and Ambitions

Roadmaps and strategies and targets

'Incentivise' sends market signals and support to businesses, citizens and governments to promote certain activities.

Incentivise

 Direct Financial Support

Incubator and investment programmes

Public-private partnerships

Public-civil partnerships

Awareness raising events

Economic Frameworks

Redesign systems to lay the foundation for circular activities and enable the transition to a circular economy 

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Rethink

**Harmonize with nature** by promoting infrastructure, production systems and sourcing that allows natural ecosystems to thrive




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Regenerate

Use longer and more often by extending and intensifying use of existing resources, products, spaces and infrastructure

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Reuse

Do better with less by using and supporting infrastructure, processes and products that are designed to minimize material, water and energy use and waste generation from production to end of use


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Reduce

Facilitate cross-collaboration by engaging city departments, industries and businesses on ambitious, closed-loop circular projects.

Support closed-loop systems and cross-sectoral synergies

High-level changes to policy and practice (such as taxation systems, investment and procurement guidelines and criteria) that disincentivize activities that perpetuate linear economic systems, as well as vision-setting (goals, roadmaps) to catalyze
action on circularity across the city

Eliminate linear incentives and set goals and incentives for circularity

Prioritize solutions that use the power of functioning ecosystems as infrastructure to provide natural services to benefit society and the environment; consider nature-based replacements for grey infrastructure.

Promote solutions inspired and supported by nature

Incorporate extended use in project planning phases; create or update city policies to allow for extended use.

Design and regulate for extended use

Ensure that infrastructure and built assets in the city are designed and upgraded to be as resource-efficient as possible.

Design infrastructure and the built environment for resource efficiency

Increase efficiency and promote local economic growth by shortening supply chains and connecting local producers to consumers.


Support local low-impact circular economies

As cities have expanded, they have conventionally pushed space for agricultural activities to the peripheries and surrounding rural areas, and have become reliant on globalised supply chains. Cities can nevertheless have a home for organic urban and peri-urban agriculture. 

Organic urban and peri-urban agriculture refers to production of food that happens either in or near the city. It includes organic farming at any scale, and can also refer to small holders, various forms of private urban farming initiatives, and community initiatives (vegetable gardens). Organic urban and peri-urban agriculture can support food security in the city, boost biodiversity, as well as stimulate local economies and community participation.

A local government may stimulate and enable organic urban and peri-urban agriculture by making spaces in and near the city available for markets, growing spaces and waste processing through spatial planning. Communities may be engaged through the use of making information and tooling available, alongside making spaces in neighbourhoods available and accessible to different people through spatial planning. Local governments can support local food services businesses in sourcing and obtaining locally grown organic crops. 


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🍏  Organic urban and peri-urban agriculture

The food system nourishes populations and employs 50% of the global workforce, but:
- it currently drives a quarter of the overshoot on the climate change planetary boundary due to its greenhouse gas (GHG) production, 
- animal farming alone uses over one-quarter of all land, equivalent to the size of the Americas,
- nearly a quarter of freshwater resources are lost due to rampant food waste, and
- it is the single largest driver of biodiversity loss.

A circular food system must address the whole value chain, from production to consumption to waste management. The four key solutions for the food system are:
- Put healthier, satiating foods first: Prioritise satiating and healthy foods with a lower environmental impact—ideally shifting calories from meat, fish, and dairy towards cereals, fruits, vegetables, and nuts.
- Go local, seasonal, and organic: Prioritise the production and consumption of local, seasonal, and organic produce (sometimes in combination with GMO to reduce pests and disease loss on crops), which can lead to a significantly reduced need for chemical inputs, fuels, and processing services that contribute to environmental impacts.
- Mainstream regenerative agriculture: Scale up agricultural practices that regenerate ecosystems, recirculate nutrients and sequester carbon by design. 
- End avoidable food waste: Minimise food loss and valorise waste following the food waste hierarchy along the supply chain and at the consumer level through better management of transport and storage, more refrigeration and smart planning, and technology at the consumer and food service levels.



🍏 Food Systems

The built environment, including housing, commercial buildings, and the necessary infrastructure for mobility, is essential for our livelihoods, but:
- the extraction of minerals used to produce construction materials is responsible for a quarter of global land use change,
- approximately 40% of global GHG emissions can be attributed to buildings’ construction, use and demolition, and
- construction and demolition processes drive nearly one-third of all material consumption. 

Making the built environment more circular must prioritise a heavy reduction in material use—while also closing the loop on materials and bringing secondary and renewable material choices to the fore. Our four key solutions for the built environment are:
- Make the most of what already exists: Make the most of existing materials by reusing, repurposing, upgrading and renovating following circular approaches. Where new builds are needed, use secondary materials and be as efficient as possible with urban planning solutions that follow circular design principles so that buildings can be reused, repurposed, and easily disassembled in the future.
- Be as energy efficient as possible: From the design phase, utilise circular strategies to create material- and energy efficient buildings. Couple these designs with a rollout of clean energy solutions, and prioritise energy-efficient appliances and retrofitting. 
- Utilise secondary materials: Maximise the high-value reuse of buildings and components where possible. Ideally, enable the utilisation of construction and demolition outputs and ensure that as much of it as possible is recycled to avoid the need for virgin materials, such as sand and gravel.
- Prioritise circular materials and approaches: Transition to using renewable wood, timber or cross-laminated timber instead of steel and concrete, or move to other locally available materials. Utilise mainstream modular construction and prioritise lightweight frames and structures to reduce cement and steel use, as well as green roofs where possible.



🏢 Built Environment

Manufactured goods, such as vehicles, textiles, appliances and equipment and their associated production processes are big employers but:
- production processes often rely on fossil fuels and currently drive one-third of the overshoot on the climate change planetary boundary due to its GHG production, 
- material- and energy-intensive industrial activities are linked to deforestation and drive 15% on both the land use and freshwater planetary boundaries, 
- manufacturing goods results in substantial amounts of hazardous industrial waste and leaks chemicals into the environment.

Here, circular solutions must tackle the full value chain, but material demand must also shrink: this will necessitate a societal shift to favouring sufficiency over excess and reducing consumption to sustainable levels. Our four key solutions for manufactured goods are:
- Mainstream industrial symbiosis and efficiency : Achieve process improvements, scrap diversion and reduction in yield losses through greater industrial symbiosis and efficiency. Foster tighter collaboration within and between industries to deliver powerful material and emissions savings.
- Extend the lifetime of machinery, equipment, and goods: Maximise the lifetime of goods that serve our daily needs to bring a number of environmental benefits. 
- Buy what's needed: Reduce the number of purchases of common electronic goods, appliances, and other equipment to sufficiency levels. 
- Eschew fast fashion in favour of sustainable textiles: Drastically reduce new clothing purchases. All used clothing should go on to be repaired, reused or, if needed, recycled appropriately. Prioritise natural and local textile manufacturing, as well as higher-quality and more durable garments. 




👕📱 Consumer Goods

Businesses

Communities

Governments

Much of the world’s croplands are situated within peri-urban areas, yet this food is often not consumed in its neighbouring urban area, rather it is exported and consumed vast distances away. By strengthening links with food producers in surrounding peri-urban and urban areas, to create city-region food systems, cities can influence the way food is produced and how resources are managed. For example, reconnecting cities with their local food production can create local economies, encourage local seasonal diets, denser local transport networks, and even support regenerative techniques that support native crop varieties. This in conjunction with trade supports a more distributed system that relies on a diverse range of suppliers, and can cycle nutrients from food wastes back to the surrounding ecosystem. 

To foster city-region food systems, local governments can engage and convene stakeholders along the local food chain, from farmers, to logistics companies, to jointly envision the path to a local circular food system. This can be facilitated through the creation of platforms to connect local stakeholders. The City can also stimulate the use of regionally and regeneratively produced foods through, for example, rewarding best practices, and raising public awareness through campaigns. 


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🍏  Strengthen urban-rural links within the food system

Biodiversity is fundamental to maintain the variety of crops and livestock needed to support and preserve ecosystem services that sustain our food system and wellbeing. As cities densify and expand in size, they typically encroach on surrounding biodiverse areas, leading to the progressive degradation of ecosystem services. In turn, this pushes away urban food systems that are dependent on material inputs often sourced outside the urban region. 

Edible green infrastructures are solutions that reimagine cities as productive sources of food, can boost local biodiversity as well as foster social cohesion. These infrastructures can take a variety of forms and are inspired by nature, for example, planting edible trees and plants throughout a city which are free to pick for residents.

Local governments can promote investments in edible green infrastructures (strategically planned multi-scale networks of different kinds of urban green and blue spaces) to create new biodiverse and productive spaces within the urban region, as well as rehabilitating polluted lands to improve soil health and productivity. Urban and spatial planning can also be used to permit these infrastructures, as well as enable residents to create their own. What is more, such solutions can be integrated within urban planning projects, for example, rain gardens and rain barrels, to reduce urban stormwater runoff and risk of floodings while redirecting and reusing urban rain and stormwater to supply urban farmers.


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🍏  Edible green infrastructures

With the continued growth of urban populations, cities are commonly facing a key challenge: how can we feed our residents with sufficient healthy and sustainable food? 

More resource-efficient methods and technologies for urban agriculture present opportunities to cultivate the urban landscape, for example through hydroponics and aquaponics systems. Resource-efficient systems can require less space, be more water efficient, and minimise inputs of artificial fertilisers and pesticides, and could be key to secure a sustainable and healthy future for cities.

Resource-efficiency in urban farming methods could mean prioritising renewable energies, for example, solar/wind energy, biogas, making efficient use of different resources, for example, reuse or recycle of heat, water, nutrients and/or spaces, applying cutting-edge emission reduction technologies, and reusing waste or by-products from urban sources, for example,  industries and households. 

Local governments can leverage land use and spatial planning tools to create and maintain a resource-efficient infrastructure including concepts like aquaponics, indoor agriculture, vertical farming, rooftop production, and edible walls. As well as support innovation in new urban agriculture technologies through in-kind and financial support for start-ups. 


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🍏  Resource-efficient food production

Current dominant, globalized food systems trigger far-reaching detrimental socioeconomic and environmental effects. As such, they struggle to meet the food demands of a growing population and face external shocks, such as resource scarcity, climate change and health crises such as the Covid-19 pandemic. 

Local governments are directly or indirectly connected to all stages of the food value chain. For this reason, it is importanto for them to leverage this strategic position and develop an initial and collective vision, setting out transformational targets, monitoring and evaluation frameworks, and key action areas and solutions urgently required to transform food systems—from food consumption and production to waste prevention and management.

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🍏  Targets and roadmaps for a circular food system

The demolition of old buildings and construction of new buildings require vast quantities of heavy materials, and significant amounts of energy and water. Where possible, it is preferable to renovate and refurbish an existing building in a circular manner rather than demolishing it to build a new one. Additionally, underutilised and vacant buildings and spaces represent an enormous untapped value, which could be leveraged to finance investments in other areas and revitalise neighbourhoods. This could include ‘meanwhile use’ or ‘intermittent use’ of buildings, which involves making temporarily empty spaces, properties and land available for use as work spaces, pop-up cafes, shops, and more. Such projects help to rethink the design of the surrounding urban space, creating attractive, safe and user-friendly areas, thus revitalising neighbourhood economies and encouraging local retail networks. 

Local governments—along with multidisciplinary teams of finance, human resources, technology, and corporate real estate stakeholders—can identify idle or underutilised spaces and determine their value, and then consider this in relation to current and future requirements of their citizens (for example, shortage of affordable housing or cultural spaces). Measures to address the underuse of buildings and spaces could include flexible zoning plans, economic disincentives for new greenfield developments in favour of refurbishing and manufacturing, as well as piloting projects with public vacant buildings.

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🏢  Make the best use of existing buildings and infrastructure

Water system refers to the water supply network for storing and supplying water for use by the community.

One of the greatest challenges of a city is to provide its inhabitants with safe, clean water from a limited fresh water supply. Improving the city’s water infrastructure efficiency, such as minimising leakages, reduces the strain put on the limited supply, which in turn, helps to ensure inhabitants gain access to clean and affordable water.

The water infrastructure of a city typically consists of components such as surface water diversions, wells, pumps, transmission pipes and canals, treatment and storage facilities, and distribution network elements (Burian et al.). Options for improving the efficiency of the system include investing in water loss reduction systems, creating and following a regular maintenance program, and better matching water supply and demand (Global Water Partnership).

Cities can improve the efficiency of their water system infrastructure by conducting a water audit, in which all water flows are traced and losses in the system are identified to map where the most efficiency improvements can be gained. Alongside this, asset management can be used to create a short-term and long-term strategy of investing in new equipment, refurbishing existing equipment and developing maintenance programmes to ensure infrastructure is as efficient as possible, and leaks are minimised. Such management programmes create financial transparency amongst all stakeholders and provide useful long-term planning for larger infrastructure changes (US EPA)

💧 Water Systems

Water is not only at the core of different public services cities provide, including application and sanitation, water also acts as a carrier of nutrients and energy which can benefit other urban systems. However, Global demand for freshwater will exceed viable resources by 40% by 2030, if we continue with business as usual ([ARUP](https://www.arup.com/-/media/arup/files/publications/w/water_and_circular_economy_whitepaper.pdf)). Exploring the synergistic link between water, food and energy in urban systems becomes central to sustainable development and the sustainable management of water. Urban changemakers in all three areas should start taking a more holistic approach to water management—from water resource management, to ecosystem protection and water supply and sanitation ([UN Water](https://www.unwater.org/water-facts/water-food-and-energy/)).

Bringing circularity within the food-water-energy nexus means recognising all urban water flows—drinking water, stormwater, wastewater and source water—as potential resources for use across these three sectors. Circular water systems can maximise synergies between food water and energy systems by protecting water availability to maintain agricultural production in water scarce regions, or by recovering energy from wastewater treatment, replacing fossil fuels used for cooking or heating. Solid organic matter, or biosolids, recovered from a sewage treatment can also be used as a fertiliser, preventing harmful chemicals from polluting water streams so that water sources are clean and safe to drink.

Local governments can govern the food-water-energy nexus by looking holistically at the city’s infrastructure. They can update city plans to integrate Green Blue Infrastructure (GBI) which can provide tangible benefits to each dimension of the food-water-energy nexus. Parks, green walls, waterways and greenways can, for example, provide food, water, fibre and fuel to support the urban ecosystem. Moreover, bringing different actors together, from the department of water resources, food safety, as well as energy and planning, is at the heart of any form of integrated planning. To spur cross-sectoral collaboration, for instance, cities can convene different actors on dedicated platforms and facilitate effective communication between different city departments and public organisations. Embedding a nexus strategy in municipal policy may lay a foundation for cross departmental budgeting and program implementation.


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💧 🍏 ⚡  Supporting solutions that maximise synergies between food water and energy systems

Designing products with a single material type to more easily recycle them after use

Design for recycling - mono-materials

Extraction and reuse of parts from end-of-life products for use in new products

Part recovery

Decentralised services that rely on the power of the crowd or the community

Crowd-based services

Working together with stakeholders and parties in other unrelated industries to implement circular economy strategies and opportunities

Cross-industry projects, pilots

Designing products to remove any barriers to recycling and enable easy recyclability

Design for recycling

Key elements of the circular economy

<p>For about five decades since the onset of rapid urbanization and industrialization, Singapore has placed significant emphasis on urban greening (including rooftop and vertical greenery, gardens, and park corridors) and conservation of the island's rich biodiversity as key components of its development approach, setting the foundation for its development as a “Garden City”.</p>