Promotor: Prof.dr. G.R. de Snoo, Co-promotor: R. Heijungs

The Council of Ministers has appointed Jan Willem Erisman, Professor of Environment and Sustainability at Leiden University, as chair of the new Scientific Climate Council (WKR) from 1 March. This council will advise the government on climate policy.

This thesis focusses on the temperature structure in protoplanetary disks. The relation between structures seen in the dust and gas-phase molecules is investigated.

We hebben 6 van de 9 grenzen overschreden die bepalen of menselijk leven in de komende generaties nog mogelijk is op aarde. Kunnen we het tij nog keren?

A new study from Leiden researchers shows that the carbon emissions of building materials are set to grow if we do not act rapidly. Even with known interventions implemented in concert, these emissions are much larger than the remaining 1.5 degree budget for building materials at today’s share, the…

It is a warm day. The sun is shining brightly while biologist Marco Roos makes his way through the bushes towards a peculiar little plant. Insects buzz, birds chirp. In the background rises the LUMC: at the Bio Science Park in Leiden, people and nature come together in a special way.

A consortium including economists, psychologists and public administration scholars from Leiden University will study public acceptance of the hydrogen transition in the Netherlands. They will look at the labour market impact, public perceptions of hydrogen and businesses’ willingness to invest.

Planets are formed in disks of gas and dust around young stars.

Detecting planets during their formation stages is crucial for understanding the history and diversity of fully developed planetary systems like our own. However, observing young planets directly is challenging because they are often deeply embedded within their host protoplanetary discs, rich in gas…

Conservation of biodiversity is one of the main challenges today. A higher degree of biodiversity results in ecosystems that can withstand adverse conditions and better provide essential ecosystem services. This is the case for both agricultural and natural systems.

Leiden University has participated in an international study carried out by the CARMENES consortium, which has discovered two small, terrestrial planets around Teegarden’s Star. The planets have masses similar to Earth and their temperatures could be mild enough to sustain liquid water on their surf…

Even though more than 4000 extra-solar planets are known today, only a small fraction of these has been captured in an image. To better understand the planet formation mechanisms in solar-like environments we started the Young Suns Exoplanet Survey (YSES).

The formation of stars and planets happens over multiple scales, which can interact. In particular, planet formation happens in the dense, complex environment of star forming regions.

Walsh

The research that is united in the Liveable Planet programme, touches upon a wide range of aspects of human life. The goal is to deepen and expand the scope and to connect more researchers. The following case studies are examples of current research projects.

Greenhouse gasses in the atmosphere and fertilizers in the groundwater have negative consequences for our environment. With an electrochemical process they can be transformed to more valuable and useful substances like fuel and alcohol. Chemistry PhD candidate Elena Perez Gallent discovered how this…

Leiden University and the Municipality of The Hague signed a collaboration agreement on sustainability on 1 November. Their main goals are to build a network, share knowledge and explore the possibilities of a Climate Centre for the people of The Hague.

Lecture

Planet formation is a surprisingly homogeneous process that does not take place gradually from inside out, but that occurs everywhere at the same time in a proto-planetary disc, as Dave Lommen has discovered. He will obtain his doctorate this week based on his research into the dust around young stars…

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.

After decades of intensive farming, the peatland area is under pressure. Researchers, farmers and policymakers work together in the Polderlab to identify future-proof types of agriculture. ‘It’s unbelievable how quickly the system bounces back without intensive fertilisation.’

In the fight for a liveable planet, we desperately need a fairer distribution of wealth and equal rights for all, argues anthropology professor Marja Spierenburg. ‘That will also generate broad-based support for sustainable development.’

Research carried out at Leiden University contributes to our knowledge of sustainability. This is essential if we want to work together to find solutions to pressing issues, such as the current climate emergency and the shortage of raw materials.

Many students are finishing their master thesis on sustainability this summer. In this blog, we reflect on their topics, approaches, and goals by highlighting theses from Governance of Sustainability, European Law, Global Archaeology, Computer Science: Artificial Intelligence, Industrial Ecology, and…

The research within the Food research programme at CML focuses on a transition towards sustainable food production and consumption systems. We investigate from a very small to a very large scale, at a local, national or international level. We do so by researching for example molecular tools, food systems,…

The world we live in is changing in many aspects at an ever-increasing speed. And it will continue to do so. How do we anticipate these changes, such as the increase in atmospheric CO2, the extinction of species and industrialisation?

How dangerous are micro- and nanoplastics? Do they affect the environment? What harm can they do to our bodies? Questions that we can now finally answer because of Fazel Abdolahpur Monikh. Together with his colleagues, he developed a method to detect and quantify nano-sized plastics. Their paper has…

The effects of sustainability projects on poorer, marginalised people should be considered at a much earlier stage. This is the opinion of Marja Spierenburg, Professor of Anthropology of Sustainable Development and Livelihood, who will give her inaugural lecture on 25 February.

A lot of municipalities work with a points system to encourage construction projects to take biodiversity and creating green areas into account. But this way of working also benefits local neighbourhoods and residents, master's student Marije Sesink discovered. She based her study on The Hague.

The province of Zuid-Holland faces a wide range of global sustainability issues caused by urbanisation, intensive horticulture and industry. The universities of Leiden, Delft and Rotterdam have the in-house expertise to define knowledge questions, set up research programmes and test results, says Prof.…

In Leiden University's Vision on Sustainability 2030, biodiversity (biological diversity) is an important focus in its teaching and research and on its campuses.

Combining different disciplines, researchers work together to formulate innovative solutions to societal problems.

Inaugural lecture

The Leiden Faculty of Archaeology is a world renowned academic centre for the study of the past. Our archaeologists and heritage experts are involved in innovative projects all over the world.

How can we best deal with the current problems caused by the human impact on the nitrogen cycle? How do we make the transition to a sustainable society? As of 1 September, nitrogen expert Jan Willem Erisman will be working on these questions at Leiden University: he will exchange the Louis Bolk Institute…

Research into the evolutionary backgrounds of our diets can help us make the right choices in diet, health and lifestyle.

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Conference

Over the last three decades, the discovery of exoplanets has revealed the boundless variety of worlds beyond our own Solar System⁠. Majority of planetary systems contain short-period planets that are larger than Earth but smaller than Neptune⁠.

Many hot, rocky planets outside of our own solar system started out as large, gaseous Neptunes. This is what astronomers at Leiden University contend in a recent online publication.

Farmers on the outskirts of Nairobi National Park protect their livestock using flashing lights on top of the animal enclosures. This system keeps lions away at night. Leiden research has shown that the method is both simple and effective. Publication in PLOS ONE.

A remarkable population of short period transiting rocky exoplanets with equilibrium temperatures on the order of 2,000 K has recently been discovered.

It is theoretically possible that habitable planets exist around pulsars, rotating neutron stars. Such planets must have an enormous atmosphere that convert the deadly X-rays and high energy particles of the pulsar into heat. That is stated in a scientific paper by astronomers Alessandro Patruno and…

A team of European astronomers under Leiden leadership has discovered that dust particles around a star already coagulate before the star is fully grown. These agglomerated dust particles are the first step in the formation of planets. The research publish their discovery in the journal of Nature As…

Northern lights, stellar winds and exoplanets. This is what astronomer's PhD research revolved around. PhD candidate astronomer Rob Kavanagh developed mathematical models to better understand the interactions between exoplanets and stellar winds and to define features of exoplanets. He will receive…

This thesis examines the link between simple molecules and the underlying structure and chemistry within protoplanetary disks - the birthplaces of planets.

Promotores: Prof.dr. A.G.G.M. Tielens, Prof.dr. L.B.F.M. Waters (UvA), Prof.dr. C. Dominik (UvA)

Astronomers led by Leiden astronomer Sebastiaan Haffert have directly imaged two planets that are gravitationally carving out a wide gap within a planet-forming disk surrounding a young star. While over a dozen exoplanets have been directly imaged, this is only the second multi-planet system to be p…

Less meat and dairy means more space for nature, leisure, climate, biodiversity, more justice, and it's good news for the economy. That's according to the thought experiment conducted by Strootman Landscape Architects and Leiden environmental scientists. They presented their findings on 11 April.