Promotor: M.L. van Hecke

The Leiden Advocacy Project on Plastic (LAPP) is a pro bono initiative concerning legal questions on plastics and is founded to address and research the legal issues related to plastic pollution.

Promotor: P.M. Brakefield

Environmental challenges such as plastic pollution and biodiversity loss require extensive monitoring. Citizen science, in which members of the public participate in scientific research, has therefore become an important approach in environmental science.

New interdisciplinary essays on key topics in mimetic studies, including three contributions by internationally renowned philosopher Catherine Malabou.

In light of climate change, it is crucial to determine whether plant species can adapt to future climates to avoid extinction. Plants adapt to various conditions by altering their functional traits, such as leaf size or photosynthetic rate. Some traits appear linked and vary together between species,…

Help us spot and clean up the plastic in the canals of Leiden! Leiden University is calling on the good folk of Leiden to help our researchers study the plastic in the city’s canals. And if you’d like our canals to be plastic-free, why not donate towards a fleet of canoes to clean them up?

The Plastic Soup Foundation and Parley for the Oceans hosted the very first Plastic Heath Summit in Amsterdam on 3 October, covering the most relevant and pressing health concerns surrounding plastics and human health. Beyond discussing the latest findings in the field we asked the urgent question:…

Plastic pollution is a major environmental issue. Although regulation is being adopted, plastic pollution is still increasing. Effective and strict enforcement is key and NGOs and civilians can be instrumental in this.

Plastics have become an integral part of modern society due to their versatility and durability.

Promotores: Prof.dr. P.M. Brakefield, Prof.dr. B.J. Zwaan (Wageningen Universiteit)

Merijn Tinga, the Plastic Soup Surfer, launched the Pick Up 10 campaign. This campaign, supported by Google and National Geographic, uses photo recognition to identify and monitor litter through an app.

FFashion, particularly fast fashion, is a major contributor to plastic pollution in the form of microplastic fibres. The 80-year-old Martindale test for interior textiles could be part of the solution.

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Two weeks after 3 October the Leiden canals were still full of plastic disposable cups. Auke-Florian Hiemstra and fellow students have fished thousands of these cups out of the canals and photographed them. Now they put a photo of one of these canal cups on Instagram every day.

Plastic pollution is a major global problem. In Geneva, world leaders are discussing a possible plastics treaty. Lecturer Esther Kentin talked to Dutch news platform NU.nl about the UN summit: ‘A treaty is only a small part of the solution.’

This is the team of LAPP:

Plastic pollution is a major global problem. In Geneva, world leaders are discussing a possible plastics treaty. Lecturer Esther Kentin talked to Dutch news platform NU.nl about the UN summit: ‘A treaty is only a small part of the solution.’

From 27 to 31 January, a workshop on the regulation of plastic pollution based on scientific evidence will be held at the Lorentz Center in Leiden.

On Friday 8 February, the first Plastic Avengers Conference took place in Amsterdam. Initiator Merijn Tinga, the Plastic Soup Surfer from Leiden, brought together ‘independent plastic fighters' to arrive at a manifesto against plastic pollution. The Leiden Advocacy Project on Plastic was also invited…

At the recent UN summit in Geneva, representatives from more than 180 countries failed to reach a global plastics agreement. Esther Kentin, a lecturer at Leiden Law School, spoke to media outlets on the issue: ‘Human health is at stake.’

On 25 September 2018, Dr. Yannick van den Brink, gave a presentation during an expert meeting on the EU Directive on procedural safeguards for children who are suspects or accused persons in criminal proceedings. Van den Brink was invited by the European Commission of the European Union.

On 3 May2017 LAPP participated in a meeting on microplastics at the Plastic Soup Foundation.

Scholars interested in European law attended a conference in Praag to present their research, exchange ideas and reconnect with colleagues and friends. As Vice-Secretary General of the ELU-S, Martijn van den Brink played a crucial role in organising the conference.

On Friday 23 November 2018 Professor W. (Willemien) den Ouden and Professor J.E. (Jacobine) van den Brink acted as keynote speakers at a conference entitled Private Enforcement of European Competition and State Aid Law: Current challenges and the way forward.

On 20 May 2019, Dr Yannick van den Brink, Assistant Professor at the Department of Child Law, participated in a live webinar titled ‘Child Pre-trial Detention. A Global Movement to Reduce Length of Stay’, together with colleagues from the United States and Mexico.

The Social Domain Platform organized a regional meeting on homelessness on September 30 at the Pauluskerk in Rotterdam. At the invitation of Valente, the trade association for organizations that provide support to vulnerable people in our society, Martijn van den Brink was invited to speak about the…

Y.N. (Yannick) van den Brink (LL.M, MA) will be appointed Assistant Professor at the Child Law Department of the Leiden Law School as of 1 August 2016.

From 10-13 June, Martijn van den Brink participated in the EU Law Mountain Seminar in the Czech Republic. This event is a regular gathering of scholars interested in public law in Europe founded by Marco Dani and Jan Komárek in 2017. These are closed events where selected researchers discuss their ongoing…

14 March 2018 a Citizens’ Dialogue about plastic-use in Europe with First-Vice President Frans Timmermans took place in Utrecht. It was one in a series of dialogues organized by the European Commission held throughout Europe. LAPP-student Emily den Boer joined the evening.

On 27 November 2019, the Royal Netherlands Academy of Arts and Sciences (Koninklijke Nederlandse Akademie van Wetenschappen) organized a symposium on the plastic pollution crisis.

LAPP students Emily den Boer and Louise Floris, together with Esther Kentin, wrote about the proposal for a plastic bottle deposit return system that has been discussed in the Dutch Parliament in April 2019.

Leiden University will install over 30 tap water stations in the autumn of 2017 at the various University buildings. The first is already in use.

Shell, our country's largest company, is constructing a vast plastics plant in the United States. And it is doing so at a time when the European Union, led by the Netherlands, is launching a major pact to combat use of plastic.

At the recent UN summit in Geneva, representatives from more than 180 countries failed to reach a global plastics agreement. Esther Kentin, a lecturer at Leiden Law School, spoke to media outlets on the issue: ‘Human health is at stake.’

The newly established Luxembourg Centre for European Law held its inaugural conference on 10-11 October 2025, exploring the theme of “European Union law and values in a changing world”. Martijn was invited to speak about the relationship between European values and democracy.

After studying medicine in Leiden, Diederik Hofstede specialised in plastic surgery. 'I was attracted by its creativity and I enjoy working with my hands.' Cosmetic surgery is just 5% of the work.'

Stephanie Rap and Yannick van den Brink, both assistant professor at the Department of Child Law, presented their research at the 11th EU Forum on the rights of the child: Children deprived of their liberty and alternatives to detention, which took place in Brussels from 6 to 8 November 2017.

One person can already make a difference, and if all students and academics were eco-friendly, the world would be a much more sustainable place. Plastic Soup Surfer Merijn Tinga opened the academic year in Leiden with this message.

This year will see the start of not one but two citizen science projects in Leiden and The Hague. This is the outcome of a large survey among residents and researchers in both university cities. The Citizen Science Lab will help the winners implement their ideas, with support from the University and…

International trade has played a major role in defining the modern global economy. Trade, however, entangles the environmental pressures of economic sectors, giving the illusion of environmental improvements, while the opposite may be occurring.

It's now possible to measure how many plastic particles there are in our food. Chinese scientists and Leiden professor Willie Peijnenburg applied their new method to lettuce and wheat. Their results were published January 20 in Nature Nanotechnology.