Biologist Laura Bertola argues that the traditional separation of lions into African and Asian subspecies is incorrect. She has discovered that Africa is actually home to two subspecies. Her PhD defense was on 18 March 2015.

On Saturday, February 11, 2023, at the Dies for Alumni event, archaeology alumni Everest Gromoll was awarded the LUF Thesis Prize. His thesis, titled ‘Neolithizers by Nurture’, explores parallels between the only two comparable climatic shifts in the history of modern humans: that of the one 12,000…

The present market regulations make it extremely risky to invest in green energy, and this is impeding the fight against climate change. This is what Oscar Kraan writes in his dissertation. PhD defence on 25 April.

Seventeen Leiden University scientists appear on the 2019 Highly Cited Researchers list, which was announced on 19 November by Clarivate Analytics.

Almost 100 billion tons of CO₂ could be pulled out of the atmosphere by the end of the century. That is, if high-income countries switch to a plant-based diet. The double carbon profit of returning farmland to its natural state would equal about 14 years’ worth of agricultural emissions, researchers…

At the OWL faculty day about 150 newcomers met their fellow students and had a chance to check out the study and research facilities at the Faculty of Science. The OWL introduction week is specially for new international bachelor’s and master’s students at Leiden University.

Two Leiden research projects that focus on increasing the biodiversity of Dutch production systems for food and ornamental horticulture have started thanks to funding from the Dutch Research Council's KIC research programme.

The role of culture and diverse knowledge systems needs to be recognized when assessing nature’s contributions to people, a new policy forum paper in Science states. Alexander van Oudenhoven and thirty global experts present a new approach that will increase the effectiveness and legitimacy of policies…

With the lecture 'China and a complicated world', a lucky draw, and of course lots of food and drinks, the Faculty of Science celebrated the year of the dog. An international mix of staff and students took part in this third local edition of the lunar new year celebration.

Seaweed, which is vital for marine life, is disappearing throughout the world at an alarming rate. Different currents and wave patterns can bring about recovery, but more research is needed. This is the conclusion of Achmad Adhitya. His PhD defence has a political edge because of his proposition and…

In an essay Professors Jan Willem Erisman (Leiden University), Chris Backes (Utrecht University) and Wim de Vries (Wageningen University) suggest amending nitrogen policy in the Netherlands. They call for a shift from a deposition to an emissions policy, with sectors responsible for reducing their own…

The first generation of Governance of Sustainability master's students has graduated. They received their diplomas during a festive ceremony at Wijnhaven on 17 September. And they will not be the last: The master's programme is only growing in popularity. ‘We are very proud of our first graduates, especially…

Did you know that each year 18 billion animals die without making it to someone’s plate? Governance of Sustainability alumna Juliane Klaura has won the second prize for her thesis about the environmental impact of global food production. She won the prize at the university-wide master thesis award event,…

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…

Mining for natural resources harms the environment. But we desperately need them, for both the development of countries and the transition to a sustainable energy system. Professor of Sustainable Resource Use Ester van der Voet researches how we can reduce the environmental impact of natural resources…

Food production in the Netherlands is an economic success but has led to many environmental issues, including nitrogen pollution. Recently, the policy to allow economic growth while reducing nitrogen losses was disapproved by the highest court in the Netherlands, casting the country into a nitrogen…

Is polder rice a feasible circular alternative for cows on peatland? A pilot experiment started this week. On May 22nd, researchers from Leiden University and Wageningen University & Research (WUR) planted roughly 3,000 rice plants on the Polderlab near Leiden. The researchers want to test rice as a…

Michiel Veldhuis received the most public votes for the C.J. Kok Public Award and may therefore call himself Discoverer of the Year. Veldhuis researches how climate change affects savannah ecosystems in Africa and how we can protect them.

The widely used pesticide thiacloprid can cause a large-scale decline in freshwater insects. This was discovered by researchers from the Living Lab in Leiden. For three months they counted the flying insects in the 36 ditches of the lab. Their research appeared in PNAS.

To generate renewable energy takes more space than one might think. New research by environmental scientist Paul Behrens and master's student John van Zalk shows how much space is needed for nine specific types of energy. Biomass, hydro and wind, while vital, take up the most space. Natural gas and…

The large-scale project NanoInformatics will assess the risks associated with nanoparticles. The project will be funded by the EU with 6.8 million euros and was launched at the beginning of this year. Three scientists from Leiden are involved. 'For the first time, this project combines the various experts…

A rapid increase in the demand for construction sand is driving shortages and inequality around the world. Researchers from the Institute of Environmental Sciences at Leiden University have mapped the growing need for sand, as well as the bottlenecks and possible solutions. They have published their…

Bacteria and fungi on organic dairy farms are significantly different from those on conventional farms. That was discovered by postdoc researcher Sofia Gomes and her supervisors Nadia Soudzilovskaia and Peter van Bodegom in collaboration with the Louis Bolk Institute and Naturalis Biodiversity Centre.…

The world abounds with different footprints that calculate human impact on the environment. Environmental specialist Kai Fang is the first person to have developed a family of footprints that allow better measurement of environmental damage and the depletion of natural sources. PhD defence on 24 Nov…

More CO2 in the atmosphere is making food crops more calorific, less nutritious and potentially more toxic.

Biodiversity in the Netherlands is having a tough time. Professor of Natural Capital Koos Biesmeijer combines research with practical advice: from the greening of industrial parks to solutions inspired by hi-tech nature. Inaugural lecture 9 March.

Soil salinity is affecting large areas in the world and millions of farmers are faced with decreasing yields and many are even forced to migrate . Dutch scientists (Prof Dr. Gerrit van Straten (Wageningen University), Prof. Dr. Peter van Bodegom (Leiden University), Prof. Dr. Jelte Rozema (VU University…

More efficient use of phosphorus fertilisers would make it possible to meet food demand in 2050, without using more of the world’s land for agriculture. This is what environmental scientists José Mogollón and colleagues have discovered by working out various future scenarios for food production and…

The origins of Surinamese rice, a digital twin of the Earth and a large big-data project in the Chilean sky: three Leiden scientists receive an ENW-KLEIN grant for innovative, fundamental research.

The book ‘The Best of Times, The Worst of Times: Futures from the Frontiers of Climate Science’ by Paul Behrens has been launched in the US, a year after its original release in Europe. In his book, Behrens describes both hopeful and pessimistic scenarios for our planet.

From fake news via WhatsApp to mini hearts from a 3D printer: four Leiden researchers have been awarded a Consolidator Grant by the European Research Council. These grants, of up to 2m euros, enable researchers to establish or expand their research team and continue to develop their career.

They are often little more than a square metre of plants, yet pavement gardens are a source of life. PhD candidate Joeri Morpurgo conducted research in the centre of Amsterdam and The Hague and discovered how important small green spaces are, especially for cities.

Sustainability challenges don’t just call for environmental scientists – they require expertise from many academic fields. Thijs Bosker and Paul Behrens have made it easier for university lecturers to integrate sustainability into their courses. Their initiative, Local Actions, offers ready-made teaching…

How do you count the nanoplastics in your body? Leiden researchers published a method in Nature Protocols today that should make this easier. Important for both environmental and medicine research.

Nitrogen professor Jan Willem Erisman and Ton Brouwer have released a new report presenting scenarios to actually meet the agricultural nitrogen targets for 2030. Their message to politicians in The Hague: ‘Look at this approach — it is possible.’

Smallholder farms in tropical regions can double their crop production by 2030 compared to 2015, a study finds to which José Mogollón (Institute of Environmental Sciences) contributed. But to achieve this, the farmers must increase the input of phosphorus beyond what is currently foreseen. The study…

Inviting members of the public to help monitor wildlife, photograph plants or conduct samplings. These are some of the many examples of Citizen Science. It is increasingly recognized as effective and impactful for collecting data, but also for engaging the public in scientific research. In Nature reviews…

The rare Ethiopian wolf is increasingly coming into contact with local cattle farmers. PhD candidate Girma Eshete explored ways of saving this elegant animal from being wiped out. Phd-defense on 5 September.

Environmental scientists in Leiden have found that the so-called leaf economics spectrum for plants can not only be applied to terrestrial ecosystems, such as forests and grasslands, but also to wetlands. Furthermore, they showed that wetland plants generally have a fast-return strategy, meaning they…

Nanomaterials can pass much further along the food chain than was previously thought. The particles can change shape and size in each organism, enabling them to pass on to the next one in the chain. Researchers from the Institute of Environmental Sciences discovered this accidentally when using a novel…

To what extent do nanoparticles accumulate in plants and animals, and what properties of the particles play a part in this? Willie Peijnenburg, professor of Environmental toxicology and biodiversity was awarded a Marie Curie grant to conduct research on the environmental effects of nanoparticles.

The vulnerability of the European electricity sector to changes in water resources is set to worsen by 2030 as a consequence of climate change. This conclusion is reached by researchers at Leiden University in an article published in Nature Energy this month.

A special relationship between plants and fungi, which plays an important role in carbon storage in soil, has the potential to slow down climate change. However, the amount of carbon stored in soil is decreasing as a result of human activity. This is what researchers say in a publication in Nature Communications.…

Morning yoga, having your resumé checked at the information market, or dancing for inclusiveness: just a small selection of the activities of the first Science PhD Day on Thursday 18 April. Around 120 PhD candidates from all eight institutes of our faculty attended the day. 'A great success', according…

‘She is an example to young researchers who are beginning to find their career path’, wrote the jury of the NWO Athena Award about Professor of Ecotoxicology Martina Vijver. It was the main reason for presenting her with one of the two awards for outstanding female scientists. Both Vijver and Nijmegen…

Master’s students in Industrial Ecology and Governance of Sustainability have helped answer organisations’ questions about sustainability

Each year a staggering 18 billion chickens, turkeys, pigs, sheep, goats, and cows either die or are killed without making it onto someone's plate. Environmental scientists Juliane Klaura, Laura Scherer, and Gerard Breeman were the first to calculate this number on a global scale. 'Reducing these numbers…

Researchers at the Faculty of Science work every day at the frontiers of knowledge, tackling today’s major societal challenges. Their work is recognised through grants, prizes and other awards. We highlight some of these achievements.

Chemical substances and nanomaterials are processed on a massive scale in diverse products, while their risks have not been properly assessed. Time and again synthesised substances have been shown to pollute the environment more than lab tests predicted. This is the warning given by Professor of Ecotoxicology…

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.