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Author Correction: Mapping urban slums and their inequality in sub-Saharan Africa 作者更正:绘制撒哈拉以南非洲城市贫民窟及其不平等状况
Pub Date : 2025-12-11 DOI: 10.1038/s44284-025-00374-z
Chengxiu Li, Le Yu, Robert Ndugwa, Adrian J. Bailey, Xiaoling Zhang, Francis Oloo, Ellasy Gulule Chimimba, Xiangzheng Deng, Jim Wright
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引用次数: 0
Observed evaporative cooling of urban trees and lawns during heatwaves 观察到热浪期间城市树木和草坪的蒸发冷却
Pub Date : 2025-12-09 DOI: 10.1038/s44284-025-00353-4
Tao Fang, Weiting Hu, Chunhua Yan, Chao Zhang, Bei Wang, Muhammad Hayat, Guo Yu Qiu
Heatwaves are an increasing threat to urban health and comfort, and evapotranspiration by urban lawns and trees offers a potential solution. However, their distinct effects and mechanisms remain unclear. Using ten years of observations, we investigate the evapotranspiration responses of urban lawns and trees to 54 heatwave events in a subtropical city. We hypothesize that urban trees and lawns exhibit distinct evapotranspiration response patterns during heatwaves due to different water-use strategies and stomatal regulations. Our results show that (1) lawns, with high canopy stomatal conductance, rapidly increase evapotranspiration (+ 37.65%), providing significant cooling (7.05 °C m−2 per day), but at the cost of rapid surface water depletion. (2) Although trees provide a lower cooling effect of 3.5 °C m−2 per day, they stabilize transpiration during heatwaves by closing their canopy stomata (−35.06%) and accessing deeper soil moisture. This strategy results in a slight decrease in transpiration rates (from 1.77 to 1.66 mm per day), ensuring more stable water use and cooling despite the extreme conditions. These findings highlight the different water-use strategies and cooling capacities of lawns and trees, offering critical insights for optimizing urban vegetation design in regions facing diverse climatic and water-availability challenges. Heatwaves pose a growing threat to cities, and vegetation is often touted as a mitigation option. This study finds that while lawns provide a burst of intense cooling, trees access deeper water and provide moderate but more prolonged relief.
热浪对城市健康和舒适的威胁越来越大,城市草坪和树木的蒸散作用提供了一个潜在的解决方案。然而,它们的独特作用和机制尚不清楚。利用10年的观测资料,研究了亚热带城市草地和树木对54次热浪事件的蒸散响应。我们假设由于不同的水分利用策略和气孔调节,城市树木和草坪在热浪中表现出不同的蒸散响应模式。结果表明:(1)具有高冠层气孔导度的草坪能快速增加地表蒸散量(+ 37.65%),提供显著的降温效果(7.05°C m−2 / d),但以地表水分的快速耗竭为代价。(2)尽管树木提供的降温效果较低,为每天3.5°C m−2,但它们通过关闭树冠气孔(- 35.06%)和获取深层土壤水分来稳定热浪期间的蒸腾作用。这一策略导致蒸腾速率略有下降(从每天1.77毫米降至1.66毫米),确保在极端条件下更稳定的用水和冷却。这些发现强调了不同的水利用策略和草坪和树木的冷却能力,为面临不同气候和水可用性挑战的地区优化城市植被设计提供了重要见解。热浪对城市的威胁越来越大,而植被通常被吹捧为缓解热浪的一种选择。这项研究发现,虽然草坪提供了强烈的降温,但树木可以获得更深的水,提供适度但更持久的缓解。
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引用次数: 0
Railways and urban scaling in England and Wales over 190 years of development 铁路和城市规模在英格兰和威尔士超过190年的发展
Pub Date : 2025-12-05 DOI: 10.1038/s44284-025-00351-6
Zhenhua Chen, Alexis Litvine, Leigh Shaw-Taylor
Understanding the long-term relationship between rail infrastructure and urban growth provides an insight into how transport systems and cities have evolved together over time. Using historical census and railway network data for England and Wales (1831–2021), we analyze how population, infrastructure provision and accessibility have scaled with one another. We find that the scaling relationships of infrastructure supply (stations and track length) and quality (accessibility) with city population, which initially differed, gradually converged toward linear proportionality. This convergence suggests that, over time, rail provision and accessibility became more proportionally aligned with population size. Periods of railway expansion coincided with the growth of small- and mid-sized cities and rising regional connectivity, whereas subsequent contractions coincided with declining accessibility and a tendency toward greater concentration in larger centers. These results highlight a long-term process of scale-dependent co-evolution between transport networks and urban systems, offering historical evidence of the enduring association of infrastructure and urban structure. Railway infrastructure and urban population evolved together in England and Wales from 1831–2021, with scaling relationships gradually converging toward proportionality. Expansion periods supported smaller cities whereas contractions concentrated growth in larger centers.
了解铁路基础设施与城市发展之间的长期关系,有助于深入了解交通系统和城市是如何随着时间的推移而共同发展的。利用英格兰和威尔士(1831-2021)的历史人口普查和铁路网数据,我们分析了人口、基础设施供应和可达性如何相互扩展。研究发现,基础设施供给(站点和轨道长度)和质量(可达性)与城市人口的比例关系从最初的差异逐渐趋同为线性比例关系。这种趋同表明,随着时间的推移,铁路供应和可达性与人口规模的比例越来越一致。铁路扩张的时期与中小城市的增长和区域连通性的提高相吻合,而随后的收缩与可达性的下降和向更大中心的集中趋势相吻合。这些结果突出了交通网络和城市系统之间规模依赖的长期共同进化过程,为基础设施和城市结构之间的持久联系提供了历史证据。从1831年到2021年,英格兰和威尔士的铁路基础设施和城市人口共同发展,规模关系逐渐向比例关系收敛。扩张时期支持小城市,而收缩时期则把增长集中在较大的中心。
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引用次数: 0
Unlocking urban climate adaptation imaginaries 释放城市气候适应想象
Pub Date : 2025-12-05 DOI: 10.1038/s44284-025-00354-3
Maria Loroño-Leturiondo, Marta Olazabal, William Lewis, Ana Terra Amorim-Maia, Aiora Zabala
Standardized approaches to urban climate adaptation often overlook the diverse needs, priorities and power dynamics embedded in local contexts, thereby risking the reinforcement of existing vulnerabilities. Here we use Q methodology and artist-produced illustrations to explore how 79 local adaptation actors across 37 countries envision climate adaptation in their cities. We identify four distinct and occasionally conflicting imaginaries: Green City, Sustainable Lifestyles, Climate Preparedness, and Top Down and Technology Driven. These imaginaries reflect the variability in adaptation conceptions across individuals and contexts. While some align with dominant Western paradigms, others advocate for transformative system change. These findings underscore the limitations of one-size-fits-all solutions and emphasize the importance of centering local communities and embracing pluralistic epistemologies. Furthermore, the study demonstrates the potential of artistic collaboration to surface tacit knowledge and reimagine urban climate futures, and calls for inclusive engagement across scales and timelines. Urban climate adaptation is inherently context dependent, shaped by local experiences and realities. Through an art–science collaboration, this study explores how local climate adaptation actors around the world imagine their cities adapting to climate change.
城市气候适应的标准化方法往往忽视了当地不同的需求、优先事项和权力动态,从而有可能加剧现有的脆弱性。在这里,我们使用Q方法和艺术家制作的插图来探索37个国家的79名当地适应行动者如何设想其城市的气候适应。我们确定了四种截然不同且偶尔相互冲突的设想:绿色城市、可持续生活方式、气候准备以及自上而下和技术驱动。这些想象反映了个体和环境之间适应观念的可变性。虽然有些人与占主导地位的西方范式保持一致,但其他人则主张进行变革性的制度变革。这些发现强调了一刀切解决方案的局限性,并强调了以当地社区为中心和接受多元认识论的重要性。此外,该研究还展示了艺术合作在揭示隐性知识和重塑城市气候未来方面的潜力,并呼吁跨尺度和跨时间线的包容性参与。城市气候适应本质上依赖于环境,受当地经验和现实的影响。通过艺术与科学的合作,本研究探讨了世界各地的当地气候适应行动者如何想象他们的城市适应气候变化。
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引用次数: 0
Urban sprawl is associated with reduced access and increased costs of water and sanitation 城市扩张与水和卫生设施的获取机会减少和成本增加有关
Pub Date : 2025-12-02 DOI: 10.1038/s44284-025-00338-3
Rafael Prieto-Curiel, Pavel Luengas-Sierra, Christian Borja-Vega
Many cities are expanding into areas with scarce rainfall and limited water retention capacity, and are also becoming elongated and sprawled, making it harder to deliver services. Here we quantify the impact of urban form on access to water. We craft comparable urban forms for over 100 cities in Asia, Africa and Latin America. For each city, we analyze the distance to the center, one of the most critical features of cities. We introduce two metrics: remoteness, which quantifies the distance of any location to the city center, and sparseness, a population-weighted average of all locations. We find that less remote areas have higher average income, are closer to critical infrastructure and have higher access to sewage and piped water. Sparser cities have higher water tariffs, lower proximity to critical infrastructure and lower access to sewage and piped water. Finally, we model urban expansion under three scenarios: compact, persistent and horizontal growth. When cities expand through compact growth rather than horizontal expansion, 220 million more people could gain access to piped water, and 190 million to sewage services. Urban sprawl reduces water access and increases costs by distancing populations from infrastructure. An analysis of over 100 cities shows that, by 2050, compact growth could provide piped water to 220 million more people than horizontal expansion.
许多城市正在向降雨稀少、蓄水能力有限的地区扩张,而且城市也在变得细长和杂乱,这加大了提供服务的难度。在这里,我们量化了城市形态对水资源获取的影响。我们为亚洲、非洲和拉丁美洲的100多个城市设计了可比较的城市形态。对于每个城市,我们分析了到中心的距离,这是城市最关键的特征之一。我们引入了两个指标:偏远性,量化任何地点到市中心的距离;稀疏性,所有地点的人口加权平均值。我们发现,越偏远的地区平均收入越高,离关键基础设施越近,污水和自来水的使用率也越高。人口稀少的城市水费更高,离关键基础设施更近,污水和管道用水更少。最后,我们在紧凑型增长、持续增长和水平增长三种情况下对城市扩张进行了建模。当城市通过紧凑型增长而不是横向扩张来扩张时,可以增加2.2亿人获得管道用水,1.9亿人获得污水处理服务。城市扩张减少了水资源的获取,使人口远离基础设施,从而增加了成本。一项对100多个城市的分析表明,到2050年,紧凑型增长可以比横向扩张多为2.2亿人提供管道水。
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引用次数: 0
Widespread practices and sustainability benefits of foraging in urban blue spaces of India 印度城市蓝色空间中觅食的广泛实践和可持续性效益
Pub Date : 2025-12-02 DOI: 10.1038/s44284-025-00337-4
Sukanya Basu, Brenda Maria Zoderer, Harini Nagendra, Peter H. Verburg, Tobias Plieninger
Urban blue spaces, such as lakes and rivers, are increasingly recognized for their ecological and social roles, yet their contributions to sustainable food systems remain understudied. Here we examine the extent and benefits of foraging in urban blue spaces across four major Indian cities through a survey of 1,200 users. We identify three forager groups, that is, ‘rare’, ‘occasional’ and ‘frequent’ foragers, whose behaviors differ in frequency and practice. Women, the elderly and marginalized communities most frequently collect, share, cook and sell edibles. Access to home or community gardens strongly motivates occasional foragers. Frequent foragers emphasize benefits relating to nutrition and income, as well as culture and social capital, whereas occasional foragers appreciate nature- and culture-related benefits. Our findings challenge conventional perspectives on urban food provisioning, highlighting urban blue spaces as vital yet overlooked spaces for food access and resilience. Integrating foraging into urban planning can enhance equitable food systems, fostering transformative change toward sustainable urban landscapes. Urban blue spaces, such as lakes and rivers, play growing roles in cities but are historically vital for providing food. Focusing on four Indian cities, this study finds diverse blue foraging practices most practiced by elderly women, especially among the most disadvantaged groups.
城市蓝色空间,如湖泊和河流,其生态和社会作用日益得到认可,但其对可持续粮食系统的贡献仍未得到充分研究。在这里,我们通过对1200名用户的调查,研究了在印度四个主要城市的城市蓝色空间中觅食的程度和好处。我们确定了三个觅食群体,即“罕见”,“偶尔”和“频繁”的觅食者,他们的行为在频率和实践上有所不同。妇女、老年人和边缘化群体最常收集、分享、烹饪和出售食物。进入家庭或社区花园强烈地激发了偶尔的采摘者。频繁的采集者强调与营养和收入以及文化和社会资本有关的好处,而偶尔的采集者则重视与自然和文化有关的好处。我们的研究结果挑战了关于城市食物供应的传统观点,强调了城市蓝色空间是食物获取和恢复力的重要但被忽视的空间。将觅食活动纳入城市规划可以加强公平的粮食系统,促进向可持续城市景观转变。城市蓝色空间,如湖泊和河流,在城市中发挥着越来越大的作用,但在历史上对提供食物至关重要。这项研究集中在印度的四个城市,发现了多种多样的蓝色觅食方式,大多数是老年妇女,尤其是在最弱势群体中。
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引用次数: 0
Understanding the potential of urban parks to promote well-being 了解城市公园促进福祉的潜力
Pub Date : 2025-11-21 DOI: 10.1038/s44284-025-00345-4
Linus W. Dietz, Sanja Šćepanović, Ke Zhou, André Felipe Zanella, Daniele Quercia
Urban parks are important for public health, but the role of specific spaces, such as playgrounds or lakes, and elements, such as benches or sports equipment, in supporting well-being is not well understood. Here, based on expert input and a review of the literature, we defined six types of health-related activity: physical, mindfulness, nature appreciation, environmental, social and cultural. We built a lexicon that links each activity to specific elements and spaces within parks present in OpenStreetMap. Using these data, we scored 23,477 parks across 35 cities worldwide on the basis of their ability to support these activities. We found clear patterns: parks in North America focus more on physical activity, while those in Europe offer more chances to enjoy nature. Parks near city centers support health-promoting activities better than those farther out. Suburban parks in many cities lack the spaces and equipment needed for nature-based, social and cultural activities. We also found large gaps in park quality between cities. Tokyo and Paris provide more equal access, while Copenhagen and Rio de Janeiro show sharp contrasts. These results can help cities create fairer parks that better support public health. City parks clearly promote health, but understanding the distribution of healthful park elements and spaces is challenging. This study scored thousands of parks across 35 major cities worldwide and found that North American parks emphasize physical activity, European parks more often promote nature appreciation and centrally located parks tend to better support health-promoting activities.
城市公园对公共卫生很重要,但特定空间(如操场或湖泊)和元素(如长椅或运动器材)在支持健康方面的作用尚未得到很好的理解。在此,基于专家的意见和对文献的回顾,我们定义了六种与健康相关的活动:身体、正念、自然欣赏、环境、社会和文化。我们建立了一个词典,将每个活动与OpenStreetMap中公园内的特定元素和空间联系起来。利用这些数据,我们根据全球35个城市的23,477个公园支持这些活动的能力对它们进行了评分。我们发现了明显的模式:北美的公园更注重身体活动,而欧洲的公园则提供更多享受大自然的机会。离市中心较近的公园比离市中心较远的公园更有利于促进健康的活动。许多城市的郊区公园缺乏以自然为基础的社会和文化活动所需的空间和设备。我们还发现,城市之间的公园质量差距很大。东京和巴黎提供了更平等的准入,而哥本哈根和里约热内卢则形成了鲜明的对比。这些结果可以帮助城市建立更公平的公园,更好地支持公众健康。城市公园显然促进健康,但了解健康公园元素和空间的分布是具有挑战性的。这项研究对全球35个主要城市的数千个公园进行了评分,发现北美的公园强调体育活动,欧洲的公园更多地提倡自然欣赏,而位于市中心的公园往往更能支持促进健康的活动。
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引用次数: 0
Fueling urban digital twins with mobile crowd data 用移动人群数据推动城市数字孪生
Pub Date : 2025-11-17 DOI: 10.1038/s44284-025-00348-1
Yujie Zhang, Yanchuan Yin, Yingqiang Hu, Guodong Sun
Urban digital twins have emerged as transformative tools for modern city management, offering unprecedented capabilities to monitor, simulate and optimize urban systems and services. However, current implementations often rely on static sensing infrastructures, limiting their ability to capture the dynamic, human-centric and socioeconomic aspects of urban environments. Mobile crowd data—real-time, high-resolution, context-rich information generated through citizen-carried mobile devices—comprise a game-changing resource for addressing these limitations. By integrating anonymized and aggregated mobile crowd data, urban digital twins can gain richer insights into urban environments and changes, citizen behavior and socioeconomic dynamics, enabling smarter, more adaptive urban planning and decision-making. Here we discuss the role of mobile crowd data in advancing urban digital twins, emphasizing the potential of such data to construct more accurate digital representations, enhance real-time responsiveness and foster mutual adaption between citizens and cities. Urban digital twins rely on static sensors and miss dynamic human and socioeconomic dimensions. Integrating anonymized mobile crowd data provides real-time, context-rich insights that improve accuracy, responsiveness and citizen co-creation.
城市数字孪生体已经成为现代城市管理的变革性工具,提供前所未有的能力来监测、模拟和优化城市系统和服务。然而,目前的实施往往依赖于静态传感基础设施,限制了它们捕捉城市环境的动态、以人为中心和社会经济方面的能力。移动人群数据——通过公民携带的移动设备生成的实时、高分辨率、内容丰富的信息——构成了解决这些限制的改变游戏规则的资源。通过整合匿名和聚合的移动人群数据,城市数字孪生体可以更深入地了解城市环境和变化、公民行为和社会经济动态,从而实现更智能、更具适应性的城市规划和决策。本文讨论了移动人群数据在推进城市数字孪生中的作用,强调了此类数据在构建更准确的数字表示、增强实时响应能力和促进公民与城市之间相互适应方面的潜力。城市数字孪生依赖于静态传感器,而忽略了动态的人类和社会经济维度。整合匿名移动人群数据提供实时的、背景丰富的见解,提高准确性、响应能力和公民共同创造。
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引用次数: 0
Understanding and improving informal settlements in African cities 了解和改善非洲城市的非正式住区
Pub Date : 2025-11-17 DOI: 10.1038/s44284-025-00356-1
Urbanization stands as a key megatrend that is shaping Africa’s future, while many cities across the continent continue to struggle with the challenges of informal settlements. At a time when COP30, held in Belém, Brazil, is rallying a global ‘mutirão’ — a collective effort — against climate change, this issue’s Focus spotlights the vital importance of elevating local voices and perspectives to drive a parallel mutirão against the unequal conditions of urban informality across African cities.
城市化是塑造非洲未来的一个关键大趋势,而非洲大陆的许多城市仍在努力应对非正规住区的挑战。在巴西贝尔萨姆举行的第三十届联合国气候变化大会(COP30)召集全球“多方协作”共同应对气候变化之际,本期《焦点》突出了提高地方声音和观点的重要性,以推动平行的多方协作,应对非洲城市中城市非正式行为的不平等状况。
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引用次数: 0
Putting children in slums at the heart of urban futures 让贫民窟的孩子成为城市未来的核心
Pub Date : 2025-11-17 DOI: 10.1038/s44284-025-00327-6
Sarah Sabry
A growing proportion of children are facing the challenges of growing up in slums. Drawing on her experience in cities with Save the Children and Cities4Children, Sarah Sabry argues that urban policy and planning must urgently prioritize the specific needs and rights of children in urban contexts, especially those living in slums.
越来越多的儿童面临着在贫民窟长大的挑战。萨拉•萨布里借鉴了她在救助儿童会和Cities4Children的城市工作经验,认为城市政策和规划必须紧急优先考虑城市环境中儿童的特殊需求和权利,尤其是那些生活在贫民窟的儿童。
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引用次数: 0
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