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

Revenue Potential

Scalability

Minimise waste through diversion: Instead of sending waste to landfill, it is redirected into other industrial processes for handling, treatment, recycling, recovery, or reuse in various forms. 

Minimise waste through design: At the outset of a process of project, plan and design such that there is zero waste or minimal waste during production, use, and at end of life. 

Minimise Waste (SDG12)

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

Save Water (SDG6)

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

Biodiversity

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

Providing water and sewage services, including water collection and distribution, water treatment systems and sewage treatment facilities

Water and Sewage

Collecting waste from households and businesses by means of refuse bins, wheeled bins, containers, etc., and providing treatment, incineration, materials recovery and reclamation, and disposal of hazardous and non-hazardous waste

Waste Management

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

Prioritise regenerative resources

Utilise waste streams as a source of secondary resources and recover waste for reuse and recycling

Use waste as a resource

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

Use digital, online platforms and technologies that provide insights to track and optimise resource use, strengthen connections between supply chain actors, and enable the implementation of circular models



Incorporate digital technology

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

Recover waste energy or generate fuels and energy from waste streams

Energy recovery from waste

Designing to reduce waste during production and use

Design out waste

Industry peers to industry peer collaboration to create joint value and identify synergies

Industry collaboration

Engage with the government on circular policies and programmes

Government collaboration

Employ technologies to gather and analyse data to provide insights on resource use

Data and insights

Replacing freshwater use with rainwater, fogwater, seawater, etc.

Alternative water use

Using renewable energy like solar, wind, etc. or renewable fuels like biomass, etc.

Renewable energy, fuels

Generating energy from waste through processes such as anaerobic digestion, gasification, incineration, etc.

Generating energy from waste

Designing products so they produce as little waste as possible during production

Design for minimal waste

Designing products so they use as little materials, water, energy, etc. as possible during use

Design for resource efficiency

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

Cross-industry projects, pilots

Participating in government programmes that support and advance the circular economy

Government programmes

Installing sensors to gather data from products and services to identify, enable and/or implement circular strategies (eg. effective resource use & logistics planning, circular business models & design)

Sensors, monitoring systems

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

Inform

Implement innovation programmes

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

Manage

Infrastructure

'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

Metrics and indicators to measure progress

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

Incentivise

Public-private partnerships

Develop infrastructure to support resource cycling

Economic Frameworks

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

Eliminate waste by maximizing the recovery of resources at the end of the use phase so that they can be reintroduced into production processes


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Recover

Maintain and repair city-owned spaces and infrastructure to increase longevity, and support opportunities for residents to do the same for privately owned items and property

Support reuse, repair, remanufacturing, maintenance of existing resources, products, spaces & infrastructure

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

Process waste into valuable industrial inputs or consumer products; distribute processed waste to users.

Process waste and ensure its re-entry into industry at its highest value

Residual organic and food wastes can offer a quasi-renewable and low-carbon source of energy. By processing organic wastes, often under high temperatures, pressures and in the absence of oxygen, organic wastes can be transformed into fuels, which can be used for heating, electricity generation, as well as transportation. A variety of technologies have been developed to generate biogas from organic materials, for example, anaerobic digestion. Such facilities can vary in scale from single units that can process the waste of a single building or neighbourhood, to large-scale facilities that can process the majority of the organic wastes generated from the entire city. 

Cities have a key role to support the utilisation of organic materials as biofuels due to their close oversight and influence on the urban waste management system. In particular, cities can support the financing of large-scale facilities to help to overcome the investment costs, as well as develop relationships with businesses to operate such facilities. 


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🍏  💧  Biogas from organic materials

Cities consume about 75% of global energy and emit between 50% and 60% of global greenhouse gases (UN-Habitat). To reduce the negative impact of their energy consumption, cities need to shift away from fossil fuels and move towards renewable energy sources. Such a shift will help cities work towards their climate change mitigation and adaptation action plans. Renewable energy technologies such as wind, water, solar, and geothermal can also help improve access to energy in vulnerable and marginalised neighbourhoods through, for example, decentralised, off-grid solutions.

Renewable energy technologies can harvest the energy in nature’s processes, such as wind, and solar radiation and geothermal heat, that can be replenished within a human lifespan. In contrast, fossil fuels are materials that are not replenished within a human lifespan and are combusted for energy, losing the fuel material and resulting in emissions.

Local governments can develop sustainable energy plans, considering different energy resources and requirements, to develop a robust strategy for the development of renewable energy technologies and infrastructure throughout the city. They can also institute specific legislation and tax systems to regulate energy production and consumption, incentivise research and development of cleaner, more efficient technologies. Via Power Purchase Agreements cities can buy renewable energy from green energy providers and fix the price in order to provide security to financial institutions to finance renewable energy infrastructure. Furthermore, increasing awareness and facilitating capacity-building on planning urban sustainable energy projects can help the uptake of clean energy across the city by different stakeholders—from citizens to businesses and institutions. Facilitating collaboration, then, will be crucial, since private companies operate most of the world’s energy systems.


⚡ Energy Systems

Businesses

Governments

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

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.](https://www.sciencedirect.com/science/article/pii/B9780123847034005098)). 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](http://www.cawater-info.net/policybriefs/pdf/tec_brief_4_water_efficiency.pdf)).

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](https://www.epa.gov/sustainable-water-infrastructure/things-local-officials-should-do-sustainable-water-infrastructure)).

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💧  Improving water infrastructure efficiency

The water consumed by households must be of a sufficiently good quality to safely drink, bathe and clean with. However, the quality of water required for each of these needs differs significantly. For example, potable or drinking water must be of a higher quality than the water used to flush a toilet or irrigate a garden (so called “greywater”).  It is possible to significantly reduce our overall water consumption by using and reusing non-potable water sources for lower quality purposes—a strategy particularly relevant for drought-stressed cities.

Greywater reuse systems can be applied at household level to collect water from showers and baths, filter and treat it, and then recirculate it to flush toilets or irrigate gardens. Alternatively, a sports centre can collect greywater from showers and hand basins and process it to be used to irrigate an adjacent sports field or community garden.

Cities can encourage the uptake of greywater reuse systems through awareness campaigns, regulations and financial incentives. Awareness campaigns can show the potential environmental and financial benefits of installing greywater systems. Regulations can be in the form of building codes and requirements in which the installation of a grey water reuse system is compulsory, unless practically infeasible. Financial incentives are usually in the form of rebates for installing such a system. Municipal governments can also lead by example and procure such greywater reuse systems in municipal or city-run buildings, such as municipal offices or schools. This can not only improve the water-efficiency of such buildings, but can also showcase the benefits of the systems, and support local market demand.



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💧  Grey-water reuse systems

Regenerate strategies phase out hazardous or toxic materials and processes and substitute them with regenerative biomass resources. A circular economy aims to mimic natural cycles—by shifting to more regenerative farming practices, for example—while also maximising the share of circular biomass that enters the economy. Regeneration can happen both at the systems level (by designing regenerative processes) as well as at the product level (by switching synthetic to organic fertilisers, for example).

Regenerate

Cycle strategies aim to cycle and reuse materials at their highest value: they maximise the volume of secondary materials re-entering the economy, ultimately minimising the need for virgin material inputs and therefore also narrowing flows. Of course, virgin materials will always be needed to a degree: all materials degrade and can’t be cycled infinitely, use energy, and require blending with virgin materials to maintain strength and functionality.

Cycle

Impacts

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Industries

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A framework of policy instruments that enabled and encourage the transition to the circular economy

Policy Instruments

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A framework of policy instruments that enable and stimulate the transition to the circular economy

The principles of a circular economy concern designing out waste, regenerating ecosystems and keeping items in use. Decoupling the economy from material flows—improving the rate of resource productivity faster than the economic growth rate—is also a consistent guide. By evolving with the growing number of applications of circular economy principles, and consolidating these strategies across thematic areas, Circle Economy’s Key Elements Framework (KE) renders the elements of the circular economy salient and serves as a basis to derive contextual strategies and interventions. 


The Framework consists of:
- Core Elements: Activities directly handling product or material flows; and uniquely,
- Enabling Elements: those that remove obstacles for core actors.


Key elements of the circular economy

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Circle Economy's framework of strategies and activities that define the circular economy

The Circular City Actions Framework provides urban changemakers with five complementary strategies they can use to start working towards a more circular system. 

The framework is action-based to provide users with concrete strategic directions and showcase the desired outcomes of each strategy. 
The framework consists of five complementary **strategies**, under which **sub-strategies** provide further detail. Finally, each sub-strategy consists of a diversity of tangible **solutions** which are framed in relation to key thematic areas. 

Note: solutions are currently focused on:
- 🍏 **Food systems**
- 🏢  **Built environment**
- 👕📱  **Consumer goods**
- ⚡ **Energy Systems**
- 🚌 **Mobility Systems**
- 💧 **Water Systems**

More thematic areas are coming soon...

'Click through each of the five strategy cards below to explore the framework and circular economy case studies in more depth!'



This framework was developed in collaboration with ICLEI, Metabolic and Ellen MacArthur Foundation with support from the MAVA Foundation. Read more about it [here]( https://circulars.iclei.org/action-framework/). 



Circular City Actions Framework

An action-based framework for local governments working towards circular cities

Thematic Areas

City Stakeholders

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Based on the work of [Bocken et al. (2016)](https://www.researchgate.net/publication/309699661_Product_design_and_business_model_strategies_for_a_circular_economy), the Four Flows Framework serves as a simple framework for managing resource flows in a circular economy by using less (Narrow), using for longer (Slow), using again (Cycle), and using clean, regenerative materials and energy (Regenerate).

These different principles of circular economy can be applied to our socioeconomic metabolism: we can design stocks like buildings, infrastructure, machinery, and vehicles to be rich resource mines for the future, and design manufactured goods and consumables to be cycled and made regenerative. Furthermore, the focus must also centre on getting more value out of fewer materials. Achieving the aims of a circular economy—minimising material use, regenerating the Earth, and preventing material losses—can be done through these four key strategies mentioned above.

Source: Circle Economy. (2023). *[The circularity gap report 2023](https://www.circularity-gap.world/2023)* (p.22). Amsterdam: Circle Economy. 

Four Flows Framework

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Yokohama

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Municipality of Yokohama

<p>The Japanese city of Yokohama has an advanced process in place for wastewater reuse; sand-filtered water is used for cleaning pipes, roads, and construction sites while ozonated water is used for toilets, air conditioners, and in small urban streams. The streams serve to increase amenity value while also mitigating risk of flooding. The recycled water is less expensive, making it an attractive option for uses that do not require potability.</p>

Yokohama finds diverse uses for recycled water

Reduced green house gas emissions released into the biosphere

Reduce Emissions (SDG13)

Producing and providing leisure and personal products and services for consumers, such as cleaning products, sports equipment and toys, personal and beauty care products, as well as domestic and personal services such as caretaking, cleaning, hairdressing and other beauty treatment, funeral and related activities

Personal Products and Services

<p>The three cities of Turku, Finland, and Yokohama and Nagano, Japan, launched the 1.5-Degree Life Campaign at the end of 2020. The campaign aims to work with youth groups to reduce emissions stemming from consumption. Youth are invited to make creative materials on their "1.5 degree lifestyles", aimed at encouraging others to adopt similar practices.</p>