Challenging the sustainability of urban beekeeping using evidence from Swiss cities

Urban beekeeping is booming, heightening awareness of pollinator importance but also raising concerns that its fast growth might exceed existing resources and negatively impact urban biodiversity. To evaluate the magnitude of urban beekeeping growth and its sustainability, we analysed data on beehives and available resources in 14 Swiss cities in 2012–2018 and modelled the sustainability of urban beekeeping under different scenarios of available floral resources and existing carrying capacities. We found large increases in hives numbers across all cities from an average 6.48 hives per km2 (3139 hives in total) in 2012 to an average 10.14 hives per km2 (9370 in total) in 2018 and observed that available resources are insufficient to maintain present densities of beehives, which currently are unsustainable.

Urbanization can help reduce income inequality

The global community has been confronted with rising income inequality, in particular, for those least developed countries (LDCs), since the same level of inequality as in advanced countries would push many LDCs into abject poverty. This paper focuses on income inequality in developing countries, particularly LDCs. First, we demonstrate the infeasibility of fiscal measures in resolving income inequality even in developed countries. Second, we show that inequality in LDCs can be largely explained by urban-rural gap. Third, we uncover the benign impacts of urbanization on urban-rural gap. This leads us to propose an out-of-box strategy—containing income inequality by promoting well-managed urbanization. Fourth, we reveal a misperception that may have contributed to the neglect of urban-rural gap in constituting national inequality. This has possibly caused anti-urbanization mentalities and practices, with adverse distributional consequences. Finally, we provide evidence-based policy suggestions aimed at reducing income inequality and poverty—two major goals of SDGs.

A convergence research perspective on graduate education for sustainable urban systems science

Sustainable urban systems (SUS) science is a new science integrating work across established and emerging disciplines, using diverse methods, and addressing issues at local, regional, national, and global scales. Advancing SUS requires the next generation of scholars and practitioners to excel at synthesis across disciplines and possess the skills to innovate in the realms of research, policy, and stakeholder engagement. We outline key tenets of graduate education in SUS, informed by historical and global perspectives. The sketch is an invitation to discuss how graduates in SUS should be trained to engage with the challenges and opportunities presented by continuing urbanization.

Exploring the transformative potential of urban food

Urban food is a key lever for transformative change towards sustainability. While research reporting on the urban food practices (UFPs) in support of sustainability is increasing, the link towards transformative potential is lacking. This is because research on urban food is often place-based and contextual. This limits the applicability of insights to large-scale sustainability transformations. This paper describes UFPs that aim to contribute to transformative change. We present signposts for potential change based on the types of intended transformative changes as described in the reviewed literature based on the processes and outcomes of the urban food policies and programmes. Secondly, we classify diverse UFPs to elevate them beyond their local, place-based contexts. We find that UFPs carry a lot of potential to facilitate sustainability transformations. Based on that analysis, we provide insights on how urban food research can further contribute to harnessing the transformative potential of UFPs for actionable purposes.

Fishing in the city for food—a paradigmatic case of sustainability in urban blue space

This article presents fishing in the city for food (FCF) as a trenchant example of urban ecology, and the ways in which urban dwellers use, interact with, and depend on urban blue spaces. Our literature review demonstrates how FCF is studied in a diverse body of scientific publications that rarely draw on each other. As such, FCF and its relevance for sustainable and just planning of urban blue space remain relatively unknown. Using the literature review, a survey of FCF in European capitals, and examples from FCF in Stockholm, we demonstrate how attention to FCF raises pertinent and interrelated questions about access to water, food and recreation; human health; animal welfare and aquatic urban biodiversity.

Harnessing sensing systems towards urban sustainability transformation

Recent years have seen a massive development of geospatial sensing systems informing the use of space. However, rarely do these sensing systems inform transformation towards urban sustainability. Drawing on four global urban case examples, we conceptualize how passive and active sensing systems should be harnessed to secure an inclusive, sustainable and resilient urban transformation. We derive principles for stakeholders highlighting the need for an iterative dialogue along a sensing loop, new modes of governance enabling direct feeding of sensed information, an account for data biases in the sensing processes and a commitment to high ethical standards, including open access data sharing.

Cross-sectional evidence of the cardiometabolic health benefits of urban liveability in Australia

Recognition is increasing globally that urban planning interventions to improve neighbourhood liveability enable healthy sustainable lifestyles and assist in the prevention and management of chronic disease. We present the spatial urban liveability index (ULI) as a tool to inform localised interventions that would create healthier, more sustainable cities and examine its associations with cardiometabolic and wellbeing-related health outcomes. The ULI and associated indicators were calculated for Melbourne address points and spatially linked with health outcomes for participants from the 2014 Victorian Population Health Survey. Residing in higher liveability areas was found to be positively associated with a more physically active lifestyle and negatively associated with BMI—more so than for a comparable walkability index. Although walkable neighbourhoods underpin a liveable city, areas with diverse ‘community, culture and leisure’ destinations displayed strongest beneficial associations with cardiometabolic health outcomes, suggesting that access to diverse local destinations may encourage more active sustainable living.

The effects of human movements on urban climate over Eastern China

We live on an urban planet with unprecedented human mobility. In this study, we collectively analyze ten large cities over densely populated Eastern China, and detect that mass people outflows during Spring Festival (SF) holiday significantly cool down urban climate expressed as urban heat island intensity variation particularly at the nighttime after minimizing the effects of other factors. We estimate that the average nighttime cooling effects of the ten large cities over Eastern China during the SF holiday relative to the nearby background period are 0.63 °C stronger during the 2000s than during the 1990s. The attribution analysis points to that the urban cooling effects are primarily caused by mass people outflows during the SF holiday. Our findings help to better understand the complex interactions of human population dynamics, urban development, and the environment, and may have important implications for promoting sustainable, people-centered, and resilient development of our urban planet.

A take-home message from COVID-19 on urban air pollution reduction through mobility limitations and teleworking

The rigorous traffic limitations during COVID-19 have forced many people to work from home, reaching an outstanding degree of teleworking and reduction in air pollution. This exceptional situation can be examined as a large-scale pilot test to determine the potential of improving urban air quality through teleworking. Based on observed traffic reductions during the COVID-19 lockdown in Barcelona, we formulate socio-occupational scenarios, with various configurations of teleworking, and simulate them using the chemistry transport model WRF-Chem with multi-layer urban scheme. By intensifying teleworking to 2, 3, and 4 days a week, averaged NO2 concentrations are reduced by 4% (−1.5 μg m−3), 8% (−3 μg m−3), and 10% (−6 μg m−3), respectively, while O3 increases moderately (up to 3 μg m−3). We propose that teleworking be prioritized and promoted as an effective contribution towards reduction of long-term urban air pollution and short-term pollution peaks.