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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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This collection features a selection of case studies, based on the global *Circularity Gap Reports*, that can mitigate climate breakdown by reducing virgin material consumption, waste and greenhouse gas emissions. The latest **[Circularity Gap Report 2023](https://www.circularity-gap.world/2023#download)** reveals that the global economy is now only 7.2% circular and outlines how circular solutions across four sectors can bring global planetary boundaries back within safe limits. 

In the six years of the *Circularity Gap Report*, the global economy has extracted and used unprecedented amounts of materials. The first edition of the *Report *in 2018 found that global circularity was 9.1% and it has decreased every year since—leaving a Circularity Gap of over 90%. If this trend continues, we will have to find more and better solutions to combat the negative effects of climate change. This is why we have identified case studies from across the globe—based on the needs of society and planetary health—that serve as real-world examples of the circular economy in action.

Circle Economy is a not-for-profit organisation working to accelerate the circular transition. Through the *Circularity Gap Reporting Initiative*, our mission is to deliver an annual global Circularity Metric that measures the state of the world economy and identifies key levers to transition to global circularity. With nature as our guide, we work alongside cross-sector stakeholders from academia, businesses, NGOs and governments to provide a powerful combination of practical and scalable interventions that transform circular opportunities into realities. 


To learn more about these interventions to accelerate the circular transition, read the latest [Circularity Gap Report 2023](https://www.circularity-gap.world/2023#download), as well as previous editions of the global [Circularity Gap Reports](https://www.circularity-gap.world/global).

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Global Circularity Gap Report 2023

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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

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

Reduced green house gas emissions released into the biosphere

Reduce Emissions (SDG13)

Reduced use of virgin materials and/or an increase of the use of secondary and bio-based materials

Reduce Material Consumption (SDG12)

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


Construction and Infrastructure

Producing indoor products for the home and office, such as furniture, including upholstery, carpets and wall-coverings, as well as cutlery, cookware, glassware, crystal, silverware, utensils, kitchenware and household specialties

Home and Office Furnishings

Producing building materials and finished and semi-finished building products for construction

Construction Materials and Products

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

Use waste as a resource

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

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

Manage

Roadmaps and strategies and targets

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


Regulate

 Regulation

Innovation-oriented public procurement

 Public Procurement

Develop circular criteria for public procurement of assets

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

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Rethink

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

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Reuse

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

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

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

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

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

Businesses

Governments

Cities can directly support the transition towards a circular economy and emission reduction targets by leading by example through their public procurement activities. This is especially true regarding the built environment, as cities manage a sizable portfolio of buildings and infrastructure. Through procurement, local governments can help to develop the market for circular products and services, including circular materials as well as product-as-a-service or leasing models for building components (such as flooring, elevators and lighting). They can also manage the existing and future building stock in a way that contributes to closed energy and material loops within supply chains, whilst minimising—and ideally avoiding—GHG emissions across the entire life-cycle of procured construction materials and activities. 

Local governments have several levers at their disposal: investing in renovation and maintenance work, retrofitting and repurposing (if necessary) existing building stock to avoid new construction, and specifying circular criteria in public tenders for the design, construction and management of buildings. These criteria could, for instance, include mandatory requirements for the use of secondary or bio-based materials in new development projects, or specify design for adaptability, deconstruction and reuse. Additionally, the uptake of ‘green contracts’—agreements that require the contractor to develop and implement a site management plan and favour certain types of resources—can also stimulate circular operations by integrating circularity in the legal relationship between building owners, operators and users. Furthermore, to increase the use of secondary materials, local governments can deploy staging areas, in which recovered construction waste can be temporarily stored for reuse. 

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🏢  Circular public procurement for new buildings and infrastructure

The need that represents the largest resource footprint, with 42.4 billion tonnes, is for construction and maintenance of houses, offices, roads and other infrastructure, especially in the developing world.

Housing

- Refurbishment and renovation of residential and commercial buildings (e.g. passive house standard including reduction in overall energy demand). This could lead to displacement of new construction.

Saving: 2.15 Gt emissions and 5.28 Gt material use 

🏠 Increase housing durability

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

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

Prioritise regenerative resources

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

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

Rethink the business model

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

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

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

Regenerative energy

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 with the government on circular policies and programmes

Government 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

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

Renewable energy, fuels

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

Key elements of the circular economy

<p>The city of Helsinki added circular economy requirements to demolition contracts, and adopts an operating model for reusing furniture and building parts from demolition and renovation projects.</p>