Making agriculture sustainable is a global challenge. In the European Union (EU), the Common Agricultural Policy (CAP) is failing with respect to biodiversity, climate, soil, land degradation as well as socio‐economic challenges. The European Commission's proposal for a CAP post‐2020 provides a scope for enhanced sustainability. However, it also allows Member States to choose low‐ambition implementation pathways. It therefore remains essential to address citizens' demands for sustainable agriculture and rectify systemic weaknesses in the CAP, using the full breadth of available scientific evidence and knowledge. Concerned about current attempts to dilute the environmental ambition of the future CAP, and the lack of concrete proposals for improving the CAP in the draft of the European Green Deal, we call on the European Parliament, Council and Commission to adopt 10 urgent action points for delivering sustainable food production, biodiversity conservation and climate mitigation. Knowledge is available to help moving towards evidence‐based, sustainable European agriculture that can benefit people, nature and their joint futures. The statements made in this article have the broad support of the scientific community, as expressed by above 3,600 signatories to the preprint version of this manuscript. The list can be found here (https://doi.org/10.5281/zenodo.3685632). A free Plain Language Summary can be found within the Supporting Information of this article.

Agricultural production is highly dependent on the weather. The mechanisms of action are complex and interwoven, making it difficult to identify relevant management and adaptation options. The present study uses random forests to investigate such highly non-linear systems for predicting yield anomalies in winter wheat at district levels in Germany. In order to take into account sub-seasonality, monthly features are used that explicitly take soil moisture into account in addition to extreme meteorological events. Clustering is used to show spatially different damage potentials, such as a higher susceptibility to drought damage from May to July in eastern Germany compared to the rest of the country. In addition, relevant heat effects are not detected if the clusters are not sufficiently defined. The variable with the highest importance is soil moisture in March, where higher soil moisture has a detrimental effect on crop yields. In general, soil moisture explains more yield variations than the meteorological variables. The approach has proven to be suitable for explaining historical extreme yield anomalies for years with exceptionally high losses (2003, 2018) and gains (2014) and the spatial distribution of these anomalies. The highest test R-squared (R²) is about 0.68. Furthermore, the sensitivity of yield variations to soil moisture and extreme meteorological conditions, as shown by the visualization of average marginal effects, contributes to the promotion of targeted decision support systems.

Fostering nature-based solutions in urban areas is an issue that receives increasing attention on the political agenda. But in many cases, only insufficient financial resources are available for the implementation of such solutions. A central issue in this context is the structure of municipal revenues, which stem from either municipal tax revenue, fees for municipal services, or fiscal transfers from other governmental levels. Many of these revenues are however absorbed by specific tasks, especially social expenditure; thus there is little room left for autonomous investments, e.g. into nature-based solutions and green infrastructure. In this chapter we elaborate on the structure of the problem such as the corresponding fiscal and constitutional restrictions and analyse which solutions are possible to allow for greater investments into multifunctional urban nature-based solutions.

Who owns the soils? What seems to be a straightforward legal issue actually opens up a debate about the ecosystem services that can be derived from soils and the distribution of benefits and responsibilities for sustaining functioning and healthy soils. In particular, agricultural land use may be constrained by a lack of properly defined property rights. Using the new institutional economics perspective, we show that multifunctionality of soils and an attribute-based property rights perspective substantiate the intuition that land property implies special obligations towards the common good. The concept of ecosystem services can illustrate the variety of beneficiaries of multifaceted soil ecosystem services. This allows identification of reasons for unsustainable soil management that result from imperfections in the definition of property rights. We suggest implications for improved governance of agricultural soils using two case studies in the EU context: the EU Common Agricultural Policy and the use of planning instruments to steer agricultural soil use in Germany. Thus, we contribute to achieving the societal goals of more sustainable land use by detecting causes of shortcomings in current land regulation and by suggesting governance approaches to support a more sustainable management of agricultural soils.

The globally increasing demand for food, fiber, and bio-based products interferes with the ability of arable soils to perform their multiple functions and support sustainable development. Sustainable soil management under high production conditions means that soil functions contribute to ecosystem services and biodiversity, natural and economic resources are utilized efficiently, farming remains profitable, and production conditions adhere to ethical and health standards. Research in support of sustainable soil management requires an interdisciplinary approach to three interconnected challenges: (i) understanding the impacts of soil management on soil processes and soil functions; (ii) assessing the sustainability impacts of soil management, taking into account the heterogeneity of geophysical and socioeconomic conditions; and (iii) having a systemic understanding of the driving forces and constraints of farmers’ decision-making on soil management and how governance instruments may, interacting with other driving forces, steer sustainable soil management. The intention of this special issue is to take stock of an emerging interdisciplinary research field addressing the three challenges of sustainable soil management in various geographic settings. In this editorial, we summarize the contributions to the special issue and place them in the context of the state of the art. We conclude with an outline of future research needs.