This thesis investigates how the assessment of circular economy (CE) at the macro-economic level can be facilitated and promoted⁠.

How might we include circularity into the models often used in IPCC reporting (in technical language, how can IAMs, dMFA models and CGE models be integrated?) What are possible futures for global resource use and what are the consequences for greenhouse gas emissions in these scenarios?

In-use stocks of products can be considered as intermediaries between human needs and the physical world.

What is the size and composition of the Dutch urban mine? How will the urban mine develop over time, and how can it be used as a source of materials as part of a circular economy?

How can we speed up the transition from large cities to a circular metropolis? This is the question that Leiden students and former students Elsemieke, Fabian and Eveline are getting their teeth into. They and seventeen other young academics are taking part in the National ThinkTank and they have four…

It’s Circular Economy Week, from 1 to 6 February. But what is it that makes an economy circular? And just how circular is our university? René Kleijn, lecturer on the honours class Circular Economy: from challenge to opportunity, explains.

A MSCA Global Fellowship that aims to explore the socioeconomic and environmental implications of a Latin America circularity transition, and its impact on the EU and global economy.

Some examples of research questions include: What framework of circular strategies should local practitioners use? How should practitioners organize their monitoring of the circular economy activities in the region of interest? What are the main products that have the most circular potential in the…

The first index to measure product safety, sustainability, and circularity, operationalising the EU’s (SSbD) framework.

A sustainable resource management is an essential aspect to satisfy the current human needs without compromising the needs of future generations.

How to ensure the environmental and economic benefits of circularity transition at macro-scale?

A scenario building web-tool and knowledge package to enable multi-level decision making for the transition to the Circular Economy

A new study on the province level material footprint of China underscores the need to improve resource efficiency in the country, which would be crucial for moving to a circular economy. The research carried out by researchers from Tsinghua University in Beijing, China and Leiden University was published…

Reuse everything and stop producing waste. By 2050, the Netherlands should have a circular economy. However, the new Integral Circular Economy Report by the Netherlands Environmental Assessment Agency (PBL) shows that there is still a long way to go. For the report, the Institute of Environmental Sciences…

To conclude, this thesis provides valuable methodological insights to address data gaps and improve environmental impact assessments within the circular economy, with a particular focus on product reuse and sharing practices. Through empirical analysis and innovative approaches, it aims to support informed…

Material circularity and energy efficiency are highly relevant and intertwined issues for the transition towards a carbon-neutral and circular built environment. In the Netherlands, the building sector has been rendered a priority towards a circular and low-carbon society.

The role of material production as a driver of environmental impacts is increasing, which calls for a better understanding of global material flows. This thesis explores the role of in-use stocks of products, buildings and infrastructure as a key driver of global material demand and discusses the implications…

Are we on the right track towards a circular economy in 2050, with fully renewable energy technology and circular construction? The CML of Leiden University, together with the Netherlands Environmental Assessment Agency (PBL), TNO, Utrecht University and RIVM, is investigating what is needed to achieve…

Fewer CO2 emissions, less airborne viral transmission, and a more sustainable form of food production: seven consortia of researchers and societal partners will put a budget of 32 million euros towards developing technological innovations. Important Leiden research on circular electronics by Prof. Dr.…

On November 19th, Dirk-Jan Kok, PhD-candidate at CML, will set course for Martinique on tallship the Morgenster. With 18 other motivated individuals, they will form the think tank that aims to come up with creative solutions to the problems that the industry faces in transitioning to circular economic…

How do we approach education that facilitates creative confidence for students that leads to innovative solutions to society’s present day and future sustainability challenges? This education research project tackles a sustainability dilemma faced by households in everyday life viz.

The expanding population and economic activity are driving up global energy consumption. Simultaneously, there is an urgent need to transition from fossil fuels to renewable sources to mitigate the climate crisis, primarily caused by fossil fuel combustion.

Nederland Circulair! is organising the week of the circular economy, for the second time. This is a great setting for Leiden University to promote several of the university’s circular initiatives. We will kick off with an initiative by alumna Noortje Schrauwen: Raw material beachcombing.

From learning modules for primary schools to a ‘Fixer-Upper Day’ and from a platform for returning broken electronic devices to a call to government: the National Think Tank has presented ten solutions that should help create a circular economy. We spoke to three Leiden members of the Think Tank about…

In an (Dutch) interview with the regional Leiden newspaper “Leidsch Dagblad”, Ruben Huele and Ester van der Voet talk about the recently started project PUMA (Prospecting the Urban Mines of Amsterdam).

Decarbonizing the building stock is critical for realizing the climate-neutral target for the Netherlands.

On 21 January, the Institute of Environmental Sciences (CML) has released two reports on circular economy and urban mining in the Netherlands. In them, together with Statistics Netherlands, they take stock of part of the Dutch ‘urban mine’: how much raw material can we reuse from the electricity grid,…

The documentary invites us to consider the question of what we consider valuable knowledge. “We need to realise that doing and thinking are intertwined in ways we did not comprehend before” argues Maikel Kuijpers, archaeologist and the producer of the documentary. “This will have consequences for the…

The availability of natural resources, the energy transition, the importance of circularity and our dependence on China. This and more is what Professor of Industrial Ecology René Kleijn's inaugural lecture is about.

The circular economy is typically seen as the progressive alternative to our wasteful linear economy, where raw materials are used to make the products that feed today’s rampant consumerist hunger, which are then thrown away. In a fascinating article, archaeologist Maikel Kuijpers reflects on the recycling…

As one of the first environmental scientists ever, Arnold Tukker received the honorary doctorate at Linköping University on Saturday 12 November. This Swedish university awarded Tukker for his scientific work to establish a circular economy.

A wide range of metals need to be mined for solar panels, wind turbines and batteries. But the overall mining activity is set to decrease as clean energy replaces fossil fuels such as oil, coal and gas.

Dutch greenhouse horticulture is a world leader when it comes to innovative capacity and sustainability, but ‘the challenges are great in terms of energy, water, environment and biodiversity,’ says Peter van Bodegom, coordinator of AgriFood at the Centre for Sustainability of the Leiden, Delft, Erasmus…