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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 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

Direct and indirect reduction in economic costs

Cost Savings

Reduced green house gas emissions released into the biosphere

Reduce Emissions (SDG13)

Reduced use of fossil fuel energy sources and/or increased use of renewable energy

Reduce Energy Consumption

Societal Services

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


Construction and Infrastructure

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 residential and non-residential construction services, such as architectural, engineering, planning, real-estate, contracting, and inspection services

Construction and Real Estate Services

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

Prioritise regenerative resources

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

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

Renewable energy, fuels

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

Manage

'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

Roadmaps and strategies and targets

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

Incentivise

Public-private partnerships

Innovation-oriented public procurement

 Public Procurement

Economic Frameworks

**Harmonize with nature** by promoting infrastructure, production systems and sourcing that allows natural ecosystems to thrive




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Regenerate

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

Prioritize solutions that use the power of functioning ecosystems as infrastructure to provide natural services to benefit society and the environment; consider nature-based replacements for grey infrastructure.

Prioritise renewable resources 

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

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

Governments

Cities consume about 75% of global energy and emit between 50% and 60% of global greenhouse gases ([UN-Habitat](https://unhabitat.org/topic/energy)). 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.


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⚡  Harnessing renewable energy from natural processes

Energy efficiency means to use less energy to perform a function—that is, eliminating energy waste, a core strategy in a circular economy. Since 2015, global improvements in energy efficiency have been declining. Reversing this trend will be needed to achieve global climate and sustainability goals. Indeed, energy efficiency could deliver more than 40% of the reduction in global energy-related greenhouse gas emissions over the next 20 years ([IEA](https://www.iea.org/topics/energy-efficiency)). In addition to reducing greenhouse gas emissions, energy efficiency can also help reduce energy extraction and imports and bring cost savings for households and industries.

Energy efficiency can be applied to a range of sectors, such as in buildings, energy generation, industry and mobility ([EESI](https://www.eesi.org/topics/energy-efficiency/description)). In buildings, energy efficiency can lead to the creation of zero-energy buildings. In regards to power generation, energy efficiency could mean smart grids for electric generation, distribution, and consumption. For mobility, energy efficiency could mean vehicles that require less fuel to cover the same distance as well as better rail and truck transportation. 

Cities can create energy efficiency programmes that involve both the public and private sector. Actions involving the private sector can be implemented in various forms, such as: regulations (e.g. setting energy efficiency standards in buildings), incentivisation (subsidising energy saving products) and informative campaigns (encouraging energy efficient behaviours). Actions involving the public sector may also be implemented in various forms, such as: public procurement standards (e.g. energy efficient power generation equipment), retrofitting public buildings (e.g. improving insulation) and upgrading energy inefficient infrastructure (e.g. replacing lighting with more energy efficient alternatives such as LED street lighting). These programmes generally have goals and timelines in which the actions are intended to be taken.


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⚡  Energy efficiency improvement programmes

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

- Lightweighting, frugal design and lifetime extension of bearing elements
- Reduction in construction losses
- Local construction materials
- Energy-efficient appliances and use
- Lower room temperature and smart metering

Saving: 3.45 Gt emissions and 4.05 Gt material use 
 

🏠 Resource efficient construction

- 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

- Hang-drying clothing
- Hot water saving
- Smart metering
- Better thermal insulation
- Lower room temperature

Saving: 1.96 Gt emissions and 0.79 material use

🏠 Resource efficient housing

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).

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

The framework consists of 21 complementary interventions, across six scenarios - one for each of the six societal needs we model. These interventions can mitigate climate impact by curbing GHG emissions

Note: interventions are currently focused on:
- 🏠 Housing 
- 🍎 Nutrition
- 🚗 Mobility
- 👚📺 Consumables
- 👩‍⚕️👨‍⚕️ Healthcare
-  🔊 Communication

These 21 interventions are spread across six societal needs and wants, with a set of solutions. Within these solutions are strategies on ’how to get there'.  

The framework moves beyond incremental action and provides solutions that will require behavioral change (dietary shifts towards less meat consumption, for example) and the adoption of state-of-the-art technologies in the industry to mitigate emissions in hard-to-abate sectors (such as steel manufacturing). It illustrates how continued globalisation can benefit from the uptake of digital solutions. The combined interventions showcase the mitigation potential that begins where the current country pledges end; illustrating the additional impact our interventions can bring to the NDCs. In short, the interventions provide input for a more profound fundamental transformation than the more current pathways that make up the vast majority of NDCs. 

Together, the combined interventions can almost double the current global Circularity Metric of 8.6%, bringing it to 17%. 

This results in:
• Shrinking global material use and extraction by 28%. 
• Cutting global GHG emissions by 39%—fully closing the Emissions Gap as defined in our report and taking into account the updated NDCs.
• Allowing the world to achieve the Paris Agreement’s goal of keeping at 1.5-degrees of warming by 2032.

*This framework was developed in the Circularity Gap Report 2021. Read more about it [here](https://www.circle-economy.com/resources/circularity-gap-report-2021)*






Global Circularity Gap Report

An intervention-based framework for nations and stakeholders working towards circular countries

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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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 Page 2   Songhai strives to improve their products all the time. Songhai studies the latest research and carrys out research literally all the time. Songhai has numerous plots of agricultural products undergoing testing to discover improvements in seeds, irrigation materials, plastic mulch (mulching film), and EM (Effective Microorganisms). All of these improved materials are available for sale. The visitor to Songhai in Porto-Novo can observe the test agricultural plots and see the products for sale. One of the most popular products is seeds. 

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Denver

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Denver is a consolidated city and county, the capital, and most populous city of the U.S. state of Colorado. Its population was 715,522 at the 2020 United States census, a 19.22% increase since the 2010 census.

City of Denver

Xcel Energy Inc. is an American utility holding company based in Minneapolis, Minnesota, serving more than 3.7 million electric customers and 2.1 million natural gas customers in Minnesota, Michigan, Wisconsin, North Dakota, South Dakota, Colorado, Texas, and New Mexico in 2019.

Xcel Energy

The city of Denver is a true leader in the development of climate-friendly strategies. In 2019, the city set a target of having 256 of its municipal buildings running exclusively on renewable energy by 2025. Delivering on this commitment will help the city reduce its emissions by circa 62,000 million tonnes of CO2e and save USD 1 million per year in electricity costs.

A strategic energy plan for Denver's municipal facilities to run on 100% renewable electricity

In 2018 Denver adopted the Denver's Green Buildings Ordinance (GBO). This city law requires developers and property owners to select from a menu of strategies for more sustainable development, which collectively seek to increase green space in Denver, improve water and storm water management, increase the use of solar and other renewable energies, foster the design of more energy-efficient buildings, and increase adoption of national green building programs, such as LEED.The ordinance applies to the following: new buildings 25,000 square feet or larger, roof permits for existing buildings 25,000 square feet or larger, building additions 25,000 square feet or larger.

Denver's Green Buildings Ordinance

Denver Urban Gardens (DUG) is the largest network of food-producing community gardens in the Colorado, comprising 190&nbsp;community and school-based gardens&nbsp;across metro Denver.

Regenerative community gardens in Denver, Colorado

As part of Denver's plan to reduce energy consumption in buildings, the city established a program that required owners of large buildings to benchmark and report energy performance in order to raise awareness and drive action. To support, the city provided tools for benchmarking and resources to improve energy efficiency.