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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

Reduced green house gas emissions released into the biosphere

Reduce Emissions (SDG13)

Extracting resources and processing them to produce materials for use bysociety

Materials and Fuels

Producing transporation equipment and providing services for thetransportation of goods and people

Transportation and Logistics

Producing building materials and providing services to create residential and non-residential infrastructure and real estate


Construction and Infrastructure

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 energy sources with less impactful alternatives and enact energy efficiency measures

Regenerative energy

Engage with the government on circular policies and programmes

Government collaboration

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

Renewable energy, fuels

Participating in government programmes that support and advance the circular economy

Government programmes

Biogas produced by the anaerobic digestion of organic solid waste can be used as an energy source for cooking, lighting and generate electricity, replacing thus other fuels. Moreover, the treatment of organic waste alleviates the solid waste crisis in urban and peri-urban area if the developing world.


Use biogas

Locally produced food has to travel shorter, which means less fuel is consumed and less greenhouse gases are generated. Moreover, buying locally produced food helps local farmers and markets and creates more jobs in the local businesses. 


Produce locally

Other

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

Manage

Infrastructure

Develop infrastructure to support sustainable lifestyles

'Regulate' changes the rules of the systems to achieve compliance through enforcement. 


Regulate

 Regulation

Environmental assessment & permits

 Spatial Planning

Living labs

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

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

Put enablers in place that allow circular businessesto grow, thrive and innovate (e.g. incubators, start-up funding, partnerships, innovation deals, business capacity building and testing groundsfor new business models).


Support circular and resource-efficient business innovations

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

The demand for transport is rising globally—but current modes are heavily material- and fossil-fuels-intensive. Emissions from the transport system could grow by 60% by 2050, and transport is the number-one user of oil worldwide. GHG emissions result not only in warming global temperatures, but also in ocean acidification, which has severe consequences for entire ecosystems and further destabilises our climate. The transport system also drives land-use change and biodiversity loss through the development of infrastructure—also releasing harmful pollutants into the ocean. Key circular solutions:

- Embrace and enable car-free lifestyles
- Invest in high-quality public transport
- Rethink unnecessary air travel
- Electrify remaining vehicles

🚌 Mobility Systems

Governments

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

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

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

Use waste as a resource

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

Rethink the business model

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

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

Regenerative materials

Replace freshwater with less impactful alternatives and enact water efficiency measures

Regenerative water

Upgrade, repair, and maintenance while in-use

Maximise lifetime of products in-use

Give products and parts another life after their end-of-use

Maximise lifetime of products after use

Ensure that biological products are properly managed and preserved

Maximise lifetime of biological products

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

Valorise waste streams - closed loop

Reuse, repurpose, and recycle waste streams within other industries

Valorise waste streams - open loop

Recover waste energy or generate fuels and energy from waste streams

Energy recovery from waste

Deliver products through business models that ensure maximum value

Product business models

Deliver services through business models that ensure maximum value

Service business models

Designing to reduce waste during production and use

Design out waste

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

Design for cyclability

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

Design for durability

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

Industry collaboration

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

Customer / consumer collaboration

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

Internal collaboration

Engage with the local community where facilities or offices are located

Community collaboration

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

Data and insights

Employ online platforms to connect and improve information sharing between stakeholders

Digital platforms

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

Alternative bio-based materials and inputs

Enacting measures that optimise material use such as 3D printing, etc.

Material efficiency

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 

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

Using materials that can be easily reused or recycled after use

Reusable, recyclable materials and inputs

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

Alternative water use

Enacting measures that optimise water use

Water efficiency

Converting fossil fuel based operations to electric

Electrification

Enacting measures that optimise energy use

Energy efficiency

Providing repair services or maintenance services for products or parts

Product maintenance, repair

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

Product upgrade

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

Self-repair, spare part service

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

Part recovery

Activities to clean, decorate, and restore products back to working condition for original or new purposes

Refurbishment, remanufacturing, renovation

Marketplaces or services that enable the second hand sale of own-brand products

Own brand second-hand sale

Marketplaces or services that enable the second hand sale of products

Second-hand sale, distribution

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

Preservation, conservation

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

Management, enrichment

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

Closed loop collection

Transforming waste products, materials for reuse within the same industry

Closed loop upcycling

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

Using closed loop recycled materials

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

Closed loop downcycling

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

Open loop collection

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

Open loop downcycling

Transforming waste products, materials for reuse within other industries

Open loop upcycling

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

Using open loop recycled materials

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

Generating energy from waste

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

Processing waste into fuel

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

Recovery and reuse of waste energy

Selling parts of modular products that can be refilled

Sale of refillable parts

Providing products through leasing, rental, or pay-per-use models instead of sales

Leasing, rental, pay per use

Providing products through sharing between consumers, customers, etc.

Peer to peer sharing

Selling high quality, long-lasting products

Sale of durable, long-lasting goods

Selling parts of modular products that can be exchanged or replaced

Sale of exchangeable parts

Providing services through a subscription plan with regular payment schemes

Subscription-based services

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

Crowd-based services

Providing services where customers are charged only when they use it

Payment per use

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

Designing products that can easily breakdown and degrade in the environment

Design for bio-degradability

Designing products of multiple parts that can be easily disassembled

Design for disassembly

Designing products of multiple parts that can be easily exchanged

Design for modularity

Key elements of the circular economy

<p>The Stockholm Royal Seaport (SRS) project is transforming the old industrial port area into a modern city environment for both residents and businesses. The City of Stockholm owns the site and controls the approvals, thus being in a position to drive the sustainability agenda. Accordingly, the city is using SRS as a living laboratory and model for the long-term aim of creating a zero fossil fuel Stockholm and adapting Sweden to the growing impacts of climate change.</p>