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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 increased knowledge and understanding as a result of the case study

Increase Awareness

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

Reduced green house gas emissions released into the biosphere

Reduce Emissions (SDG13)

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)

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

Agri/Food

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

Agriculture

Utilise bio-based, reusable, non-toxic and non-critical materials

Regenerative materials

Reuse, repurpose, and recycle waste streams within other industries

Valorise waste streams - open loop

Conduct research

Includes measures that protect and enhance ecosystems and biodiversity both within and beyond city boundaries, as well as actions to restore degraded ecosystems.


Protect and restore local ecosystems

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


Support local low-impact circular economies

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

Communities

Engage with the local community where facilities or offices are located

Community collaboration

Designing products that can easily breakdown and degrade in the environment

Design for bio-degradability

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

Regenerative energy

Selling parts of modular products that can be exchanged or replaced

Sale of exchangeable parts

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

Cross-industry projects, pilots

Designing to enable multiple uses and lifecycles of a product and its materials

Design for cyclability

Engaging in discussions with government bodies and policymakers to push for regulations that support the circular economy

Advocacy for circular economy policy

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

Renewable energy, fuels

Designing products of multiple parts that can be easily exchanged

Design for modularity

Working together with industry peers to engage in business activities or exploratory projects that advance the circular economy

Joint industry ventures, projects, pilots

Providing products through sharing between consumers, customers, etc.

Peer to peer sharing

Transforming waste products into materials and lower value products within other industries

Open loop downcycling

Providing DIY repair kits or spare part programmes for enabling self-repair

Self-repair, spare part service

Engage and guide customers and consumers to ensure circular use of products

Customer / consumer collaboration

Transforming waste products, materials for reuse within the same industry

Closed loop upcycling

Designing to reduce waste during production and use

Design out waste

Allowing customers to alter and modify certain features of the product

Customisation

Facilitate discussions and meetings between internal team members to identify circular opportunities

Dialogue with internal stakeholders

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

Generating energy from waste

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

While resources are in-use, maintain, repair and upgrade them to maximise their lifetime and give them a second life through take back strategies when applicable

Stretch the lifetime

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

Industry collaboration

Preserving and conserving biological products such as food, forests, etc.

Preservation, conservation

Working together with the community and engaging them in the company operations

Joint product development

Reuse, repurpose, and recycle waste streams within the same industry

Valorise waste streams - closed loop

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

Alternative water use

Initiatives with disadvantaged communities, minorities, people distanced from the labour market

Give-back programmes

Processing waste streams into fuels such as biogas, biofuels, pellets, etc.

Processing waste into fuel

Using bio-based materials such as bioplastics, mushroom-based materials, etc.

Alternative bio-based materials and inputs

Using waste materials that have been processed and recycled to produce new products within other industries

Using open loop recycled materials

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

Data and insights

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

Design for minimal waste

Takeback and return of products from customers after end-of-use

Takeback programmes

Transforming waste products, materials for reuse within other industries

Open loop upcycling

Upgrade, repair, and maintenance while in-use

Maximise lifetime of products in-use

Enacting measures that optimise water use

Water efficiency

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

Design for durability

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

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

Crowd-based services

Marketplaces or services that enable the second hand sale of products

Second-hand sale, distribution

Engage internally to guide employees and facilitate greater knowledge sharing between internal divisions

Internal collaboration

Collection programmes that process products and parts for reuse or recycling within other industries

Open loop collection

Engage with the government on circular policies and programmes

Government collaboration

Engaging in discussions with customers to educate and raise awareness of the circular economy and explore circular opportunities together

Customer dialogue, marketing 

Integrating circular economy thinking into employee evaluations that are tied to professional compensation

Financial incentives tied to circular economy

 Develop research, structure knowledge, encourage innovation networks and disseminate findings with integrity


Strengthen and advance knowledge

Designing products so they are able to be easily repaired

Design for repair

Employ online platforms to connect and improve information sharing between stakeholders

Digital platforms

Using <a href="https://echa.europa.eu/information-on-chemicals" target="_blank">materials that are not toxic or hazardous</a>.

Non-toxic materials and inputs

Integrate principles of circularity into primary, secondary and tertiary curriculum and conduct workplace trainings

 Education and Curriculum

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

Enacting measures that optimise energy use

Energy efficiency

Recover waste energy or generate fuels and energy from waste streams

Energy recovery from waste

Converting fossil fuel based operations to electric

Electrification

Collection programmes that process products and parts for reuse or recycling within the same industry

Closed loop collection

Selling high quality, long-lasting products

Sale of durable, long-lasting goods

Employing artificial algorithms and robotics to identify, enable and/or implement circular strategies (eg. effective resource use & logistics planning, circular business models & design)

Advanced robotics, artificial intelligence

Connecting products and services into the internet of things to identify, enable and/or implement circular strategies (eg. effective resource use & logistics planning, circular business models & design)

Internet enabled, connected operations

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

Use waste as a resource

Developing or utilising online platforms to enable circular economy opportunities through information, product or service offering

Online platforms

Putting in place purchasing guidelines for procurement departments and evaluating suppliers on circular economy principles

Circular procurement

Providing upgrade programmes or upgrade services for products or parts of products

Product upgrade

Transforming waste products into materials and lower value products within the same industry

Closed loop downcycling

Designing products to increase consumer’s emotional attachment and ensure longer use

Design for product attachment, emotional durability

Replace freshwater with less impactful alternatives and enact water efficiency measures

Regenerative water

Providing repair services or maintenance services for products or parts

Product maintenance, repair

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

Prioritise regenerative resources

Ensure that biological products are properly managed and preserved

Maximise lifetime of biological products

Consider opportunities to create greater value and align incentives that build on the interaction between products and services

Rethink the business model

Developing or utilising online marketplaces to enable the peer-to-peer exchange of products and services

Peer-to-peer online marketplaces

Engaging in discussions with industry stakeholders to share circular economy best practices and push the industry towards greater circularity

Guidance, dialogue with industry stakeholders

Recovering and reusing waste heat, gas, etc. for energy

Recovery and reuse of waste energy

Participating in government programmes that support and advance the circular economy

Government programmes

Selling parts of modular products that can be refilled

Sale of refillable parts

Designing products to be reused for the same or different purposes in multiple lifecycles

Design for reuse

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

Design for physical durability

Using waste materials that have been processed and recycled to produce new products within the same industry

Using closed loop recycled materials

Using <a href="http://ec.europa.eu/growth/sectors/raw-materials/specific-interest/critical_sv" target="_blank">materials that are not considered critical</a>.

Non-critical materials and inputs 

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

Design for recycling - mono-materials

Managing and enriching biological products such as soil, land, etc.

Management, enrichment

Key elements of the circular economy

<p>This report showed how urban agriculture can develop in Accra to become more sustainable and presented examples of circularity in two different areas of Accra: Plant Pool and Roman Ridge.</p><p>For instance, training to use on-site poultry manure composting to replace fertilizers have been provided on both sites. This method can lead to not only improving vegetable quality, but also to reduced threats to health and environment. 11 of 12 farmers interviewed on Plant Pool have set up their own composting sites.</p>