Stefan Siebert

Biographic Data

ID6570200
NAMEStefan Siebert
GIVEN NAMESStefan
FAMILY NAMESiebert
SIGNATURESIEBERT S
AFFILIATIONSUniversity of Bonn
ORCID0000-0002-9998-0672
VERIFIEDYes
TOTAL WORKS27
TOTAL CITATIONS15
AUTHOR COUNT27
EDITOR COUNT0
FIRST PUBLICATION YEAR2010
LATEST PUBLICATION YEAR2025
H-INDEX2

  • Different places, different challenges: Mapping global variations in agrifood-system burdens

    Open AccessChristian Levers, Zia Mehrabi et al.ARTICLEEnvironmental Research Letters2025

    The global agrifood system is central to many challenges humanity faces today. Despite significant growth in total production, it fails to ensure food security for all, drives biodiversity decline, and majorly contributes to climate change. Research on agrifood-system burdens often focusses on the national level and isolated burdens, ignoring their systemic complexity. We address this knowledge gap by combining global subnational datasets proxyin…

  • Evidence for increasing global wheat yield potential

    Open AccessJose Rafael Guarin, Pierre Martre et al.ARTICLEEnvironmental Research Letters2022

    Wheat is the most widely grown food crop, with 761 Mt produced globally in 2020. To meet the expected grain demand by mid-century, wheat breeding strategies must continue to improve upon yield-advancing physiological traits, regardless of climate change impacts. Here, the best performing doubled haploid (DH) crosses with an increased canopy photosynthesis from wheat field experiments in the literature were extrapolated to the global scale with a …

  • Quantifying Earth system interactions for sustainable food production via expert elicitation

    Open AccessAnna Chrysafi, Vili Virkki et al.ARTICLENature Sustainability2022Cited by: 1References: 9

    Several safe boundaries of critical Earth system processes have already been crossed due to human perturbations; not accounting for their interactions may further narrow the safe operating space for humanity. Using expert knowledge elicitation, we explored interactions among seven variables representing Earth system processes relevant to food production, identifying many interactions little explored in Earth system literature. We found that green…

  • Co-Benefits Through Coordination of Climate Action and Peacebuilding: A System Dynamics Model

    Open AccessHéctor Morales-Muñoz, Arwen Bailey et al.ARTICLEJournal of Peacebuilding &…2022Cited by: 2References: 18

    Climate disasters affect human security and development, moreso in fragile and conflict-affected contexts where population’ capacities to cope with climate change are compromised. Responses to such crises lie at the nexus of humanitarian assistance, development, and peacebuilding. Yet, there are still too few integrated programmatic responses coordinating peacebuilding and climate actions to ensure a progressive human development. This research d…

  • Crop harvested area, not yield, drives variability in crop production in Iran

    Open AccessEhsan Eyshi Rezaei, Gohar Ghazaryan et al.ARTICLEEnvironmental Research Letters2021

    Increasing population and a severe water crisis are imposing growing pressure on Iranian cropping systems to increase crop production to meet the rising demand for food. Little is known about the separate contribution of trends and variability of the harvested area and yield to crop production in severely drought-prone areas such as Iran. In this study we (a) quantify the importance of harvested area and yield on trends and variability of crop pr…

  • Nutrient supply affects the yield stability of major European crops—a 50 year study

    Open AccessHella Ellen Ahrends, Stefan Siebert et al.ARTICLEEnvironmental Research Letters2020

    Yield stability is important for food security and a sustainable crop production, especially under changing climatic conditions. It is well known that the variability of yields is linked to changes in meteorological conditions. However, little is known about the long-term effects of agronomic management strategies, such as the supply of important nutrients. We analysed the stability of four major European crops grown between 1955 and 2008 at a lo…

  • Multiple cropping systems of the world and the potential for increasing cropping intensity

    Open AccessKatharina Waha, Jan Philipp Dietrich et al.ARTICLEGlobal Environmental Change2020Cited by: 5References: 3

    Multiple cropping, defined as harvesting more than once a year, is a widespread land management strategy in tropical and subtropical agriculture. It is a way of intensifying agricultural production and diversifying the crop mix for economic and environmental benefits. Here we present the first global gridded data set of multiple cropping systems and quantify the physical area of more than 200 systems, the global multiple cropping area and the pot…

  • Drought vulnerability and risk assessments: State of the art, persistent gaps, and research agenda

    Open AccessMichael Hagenlocher, Isabel Meza et al.ARTICLEEnvironmental Research Letters2019

    Reducing the social, environmental, and economic impacts of droughts and identifying pathways towards drought resilient societies remains a global priority. A common understanding of the drivers of drought risk and ways in which drought impacts materialize is crucial for improved assessments and for the identification and (spatial) planning of targeted drought risk reduction and adaptation options. Over the past two decades, we have witnessed an …

  • Flexibility and intensity of global water use

    Open AccessYue Qin, Nathaniel D Mueller et al.ARTICLENature Sustainability2019Cited by: 6References: 7

  • Genetic yield gains of winter wheat in Germany over more than 100 years (1895–2007) under contrasting fertilizer applications

    Open AccessHella Ellen Ahrends, W Eugster et al.ARTICLEEnvironmental Research Letters2018

    For highly productive regions such as Germany, the increase of wheat grain yields observed throughout the 20th century is largely attributed to the progress in crop breeding and agronomic management. However, several studies indicate a strong variability of the genetic contribution across locations that further varies with experimental design and variety selection. It is therefore still unclear to which extent management conditions have promoted …

  • Wirtschaftsfaktor Sporttourismus: Ressourcenmanagement, Produkt- und Destinationsentwicklung

    Ralf Roth, Jürgen Schwark et al.BOOKWirtschaftsfaktor Sporttourismus2017

    Im Sporttourismus gehen zwei so vielseitige wie komplexe Lebens- und Wirtschaftsbereiche eine enge Verbindung ein: Reisen und Sport. Dabei fordert der rasante Wandel im Freizeit- und Reiseverhalten heutige Entscheidungsträger und Marktakteure heraus. Menschen verreisen kürzer und häufiger, sie sind mobiler und Unbekanntem gegenüber aufgeschlossen. Auch ziehen neue Sportarten und Bewegungsformen Reisende in ihren Bann. Die vielfältigen fach- und b…

  • Weather impacts on crop yields - searching for simple answers to a complex problem

    Open AccessStefan Siebert, Heidi Webber et al.ARTICLEEnvironmental Research Letters2017

  • Heat stress is overestimated in climate impact studies for irrigated agriculture

    Open AccessStefan Siebert, Heidi Webber et al.ARTICLEEnvironmental Research Letters2017

    Climate change will increase the number and severity of heat waves, and is expected to negatively affect crop yields. Here we show for wheat and maize across Europe that heat stress is considerably reduced by irrigation due to surface cooling for both current and projected future climate. We demonstrate that crop heat stress impact assessments should be based on canopy temperature because simulations with air temperatures measured at standard wea…

  • Bringing it all together: Linking measures to secure nations’ food supply

    Open AccessMatti Kummu, Marianela Fader et al.ARTICLECurrent Opinion in Environmental…2017Cited by: 1References: 8

  • Causes and trends of water scarcity in food production

    Open AccessMiina Porkka, Dieter Gerten et al.ARTICLEEnvironmental Research Letters2016

    The insufficiency of water resources to meet the needs of food production is a pressing issue that is likely to increase in importance in the future. Improved understanding of historical developments can provide a basis for addressing future challenges. In this study we analyse how hydroclimatic variation, cropland expansion and evolving agricultural practices have influenced the potential for food self-sufficiency within the last century. We con…

  • Intensity of heat stress in winter wheat—phenology compensates for the adverse effect of global warming

    Open AccessEhsan Eyshi Rezaei, Stefan Siebert et al.ARTICLEEnvironmental Research Letters2015

    Higher temperatures during the growing season are likely to reduce crop yields with implications for crop production and food security. The negative impact of heat stress has also been predicted to increase even further for cereals such as wheat under climate change. Previous empirical modeling studies have focused on the magnitude and frequency of extreme events during the growth period but did not consider the effect of higher temperature on cr…

  • Leverage points for improving global food security and the environment

    Open AccessPaul West, Paul C West et al.ARTICLEScience2014

    How to optimize global food production Keeping societies stable and managing Earth's resources sustainably depend on doing a good, steady job producing and distributing food. West et al. asked what combinations of crops and regions offer the best chance of progress. Their analysis focused on reducing greenhouse gas emissions, nutrient pollution, water use, and food waste. They identify regions that are likely to yield the best balance between app…

  • Diet change—a solution to reduce water use

    Open AccessMerja Jalava, Matti Kummu et al.ARTICLEEnvironmental Research Letters2014

    VK: T20702

  • Impact of heat stress on crop yield—on the importance of considering canopy temperature

    Open AccessStefan Siebert, Frank Ewert et al.ARTICLEEnvironmental Research Letters2014

    Increasing crop productivity while simultaneously reducing the environmental footprint of crop production is considered a major challenge for the coming decades. Even short episodes of heat stress can reduce crop yield considerably causing low resource use efficiency. Studies on the impact of heat stress on crop yields over larger regions generally rely on temperatures measured by standard weather stations at 2 m height. Canopy temperatures measu…

  • Future crop production threatened by extreme heat

    Open AccessStefan Siebert, Frank EwertARTICLEEnvironmental Research Letters2014

    Heat is considered to be a major stress limiting crop growth and yields. While important findings on the impact of heat on crop yield have been made based on experiments in controlled environments, little is known about the effects under field conditions at larger scales. The study of Deryng et al (2014 Global crop yield response to extreme heat stress under multiple climate change futures Environ. Res. Lett. 9 034011), analysing the impact of he…

  • From Food Insufficiency towards Trade Dependency: A Historical Analysis of Global Food Availability

    Open AccessMiina Porkka, Matti Kummu et al.ARTICLEPLoS ONE2013

    Achieving global food security is one of the major challenges of the coming decades. In order to tackle future food security challenges we must understand the past. This study presents a historical analysis of global food availability, one of the key elements of food security. By calculating national level dietary energy supply and production for nine time steps during 1965-2005 we classify countries based on their food availability, food self-su…

  • Improvements in crop water productivity increase water sustainability and food security—a global analysis

    Open AccessKate A Brauman, Stefan Siebert et al.ARTICLEEnvironmental Research Letters2013

    Irrigation consumes more water than any other human activity, and thus the challenges of water sustainability and food security are closely linked. To evaluate how water resources are used for food production, we examined global patterns of water productivity—food produced (kcal) per unit of water (l) consumed. We document considerable variability in crop water productivity globally, not only across different climatic zones but also within climat…

  • Lost food, wasted resources: Global food supply chain losses and their impacts on freshwater, cropland, and fertiliser use

    Open AccessMatti Kummu, Hans de Moel et al.ARTICLEThe Science of The Total…2012

    Reducing food losses and waste is considered to be one of the most promising measures to improve food security in the coming decades. Food losses also affect our use of resources, such as freshwater, cropland, and fertilisers. In this paper we estimate the global food supply losses due to lost and wasted food crops, and the resources used to produce them. We also quantify the potential food supply and resource savings that could be made by reduci…

  • Solutions for a cultivated planet

    Open AccessJonathan A Foley, Josep Antoni Fluixà et al.ARTICLENature2011

    Increasing population and consumption are placing unprecedented demands on agriculture and natural resources. Today, approximately a billion people are chronically malnourished while our agricultural systems are concurrently degrading land, water, biodiversity and climate on a global scale. To meet the world's future food security and sustainability needs, food production must grow substantially while, at the same time, agriculture's environmenta…

  • Groundwater use for irrigation – a global inventory

    Open AccessStefan Siebert, J Burke et al.ARTICLEHydrology and earth system sciences2010

    Irrigation is the most important water use sector accounting for about 70% of the global freshwater withdrawals and 90% of consumptive water uses. While the extent of irrigation and related water uses are reported in statistical databases or estimated by model simulations, information on the source of irrigation water is scarce and very scattered. Here we present a new global inventory on the extent of areas irrigated with groundwater, surface wa…