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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

Direct and indirect reduction in economic costs

Cost Savings

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)

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

Providing electricity and gas services, including traditional and renewable energy generation, natural and manufactured gas and operating gas networks

Energy Utilities and Independent Power Producers

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

Providing air, water, rail, and land transportation for passengers, such as airlines, airports, ferries, cruise-ships, tour boat operators, marine ports, railways, train stations, tour bus operators, vehicle rental, and taxi companies, travel agencies and related services

Passenger Transport Services

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

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

Generating energy from waste

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

Recovery and reuse of waste energy

Develop infrastructure to support resource cycling

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

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Rethink

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

Support closed-loop systems and cross-sectoral synergies

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

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

Cities are responsible for 60% of global resource consumption, and with increasing urbanisations, there are growing concerns about forthcoming shortages (water, food, energy). Urban sprawl is costly, damages the environment and affects quality of life. Making cities sustainable will need rethinking of every element of urban living, including the neighbourhood-scale. 

Self-sufficient and socially inclusive neighbourhoods are centralised, self-contained communities, organised in a way that minimises dependency on inputs from outside the system and maximises interaction between its inhabitants. They often produce their own energy and treat their own wastewater, improving security and efficiency of materials, while offering new livelihood opportunities and local value creation.

Local governments can adopt more sustainable and efficient practices in constructing these areas. Through direct and indirect economic incentives, they can push the true costs of infrastructure onto developers and create a favourable real estate climate that helps with empty land in inner-city neighbourhoods. Then, cities can implement circular land planning through urban renewal projects. Building more self-sufficient and circular neighbourhoods will require, however, multi-stakeholder collaborations between municipalities, land developers, construction and waste industries and building owners.

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🏢⚡  Self-sufficient neighbourhoods 

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

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

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

Own brand second-hand sale

Utilising data and models to to identify, enable and/or implement circular strategies (eg. effective resource use & logistics planning, circular business models & design)

Data analytics, modelling

Allowing customers to alter and modify certain features of the product

Customisation

Designing products so they are able to be easily repaired

Design for repair

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

Peer-to-peer online marketplaces

Providing repair services or maintenance services for products or parts

Product maintenance, repair

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

 Education and Curriculum

Transforming waste products, materials for reuse within the same industry

Closed loop upcycling

Ensure that biological products are properly managed and preserved

Maximise lifetime of biological products

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

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

Recover waste energy or generate fuels and energy from waste streams

Energy recovery from waste

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

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

Leasing, rental, pay per use

Using materials that can be easily reused or recycled after use

Reusable, recyclable materials and inputs

Selling parts of modular products that can be exchanged or replaced

Sale of exchangeable parts

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

Using closed loop recycled materials

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

Alternative bio-based materials and inputs

Deliver services through business models that ensure maximum value

Service business models

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

Preservation, conservation

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

Product upgrade

Provide guidance or professional training to educate employees to use circular economy principles

Training on the circular economy

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

Design for product attachment, emotional durability

Selling high quality, long-lasting products

Sale of durable, long-lasting goods

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

Online platforms

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

Takeback programmes

Marketplaces or services that enable the second hand sale of products

Second-hand sale, distribution

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

Circular procurement

Deliver products through business models that ensure maximum value

Product business models

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

Design for resource efficiency

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

Design for durability

Participating in government programmes that support and advance the circular economy

Government programmes

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

Using open loop recycled materials

Working together with customers to jointly create products fit for them

Co-creation

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

Valorise waste streams - closed loop

Employ online platforms to connect and improve information sharing between stakeholders

Digital platforms

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 

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

Regenerative materials

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

Material efficiency

Providing services where customers are charged only when they use it

Payment per use

Providing products through sharing between consumers, customers, etc.

Peer to peer sharing

Engage with the government on circular policies and programmes

Government collaboration

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

Advocacy for circular economy policy

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

Data and insights

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

Closed loop collection

Reuse, repurpose, and recycle waste streams within other industries

Valorise waste streams - open loop

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

Customer / consumer collaboration

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

Rethink the business model

Providing services through a subscription plan with regular payment schemes

Subscription-based services

Designing to reduce waste during production and use

Design out waste

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

Regenerative energy

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

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

Self-repair, spare part service

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

Alternative water use

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

Design for minimal waste

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

Design for cyclability

Enacting measures that optimise water use

Water efficiency

Converting fossil fuel based operations to electric

Electrification

Designing products of multiple parts that can be easily exchanged

Design for modularity

Key elements of the circular economy

<p>The Hammarby Sjöstad district in Stockholm was designed around the closed-loop metabolism concept, which embraces synergies among water, energy, and transportation services. The district is heated by purified waste water, combustion of household waste and biofuel; once heat has been extracted from waste water, it is used for cooling. The biogas produced is used to run local transit.</p>