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Modeled temperature, mortality impact and external benefits of cool roofs and rooftop photovoltaics in London 伦敦凉爽屋顶和屋顶光伏发电的温度、死亡率影响和外部效益模型
Pub Date : 2024-10-01 DOI: 10.1038/s44284-024-00138-1
Charles H. Simpson, Oscar Brousse, Tim Taylor, James Grellier, Jonathon Taylor, Lora E. Fleming, Mike Davies, Clare Heaviside
Population exposure to high temperatures poses health risks and increases mortality. ‘Cool roofs’ (high-albedo roofs) and rooftop photovoltaics (RPV) may reduce temperatures in urban areas. Here, using advanced urban climate modeling, we model impacts of these measures on air temperature and heat-related mortality in London during the record-breaking hot summer of 2018. We estimate changes in mean near-surface air temperature of −0.3 °C in the RPV scenario and −0.8 °C in the cool roof scenario. We find that the heat-related mortality in this period (estimated 655–920) could have been reduced by 96 (12%) by RPV, or 249 (32%) by cool roofs, in scenarios where all roofs have these measures. Monetized using value of statistical life, we estimate benefits for RPV and cool roofs of £237 M and £615 M, respectively. We estimate that up to 20 TWh of electrical energy would be generated in the full RPV scenario. We show that, for conditions such as in London June–August 2018, RPV or cool roofs may reduce near-surface air temperatures and associated heat-related mortality, with cool roofs having a larger effect. This study used the case of summer 2018 in London to show that rooftop photovoltaics could have reduced heat-related mortality by 12% while cool roofs could have reduced it by 32%. In addition, rooftop photovoltaics generate up to 20 TWh of electricity.
人口暴露在高温下会带来健康风险并增加死亡率。凉爽屋顶"(高隔热屋顶)和屋顶光伏发电(RPV)可以降低城市地区的气温。在此,我们利用先进的城市气候建模,模拟了这些措施在 2018 年破纪录的炎热夏季对伦敦气温和热相关死亡率的影响。我们估计,在 RPV 情景下,近地面平均气温的变化为-0.3 °C,而在凉爽屋顶情景下,近地面平均气温的变化为-0.8 °C。我们发现,在所有屋顶都采用这些措施的情景下,RPV 可使这一时期的热相关死亡率(估计为 655-920 例)降低 96 例(12%),凉爽屋顶可使这一时期的热相关死亡率降低 249 例(32%)。使用统计寿命值进行货币化,我们估计可变资本和冷却屋顶的效益分别为 2.37 亿英镑和 6.15 亿英镑。我们估计,在全部 RPV 方案中,可产生高达 20 太瓦时的电能。我们表明,在伦敦 2018 年 6 月至 8 月这样的条件下,RPV 或凉爽屋顶可降低近地面气温和相关的热相关死亡率,凉爽屋顶的效果更大。本研究以伦敦 2018 年夏季为例,表明屋顶光伏发电可将与热相关的死亡率降低 12%,而凉爽屋顶可将死亡率降低 32%。此外,屋顶光伏发电可产生多达 20 TWh 的电力。
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引用次数: 0
Policymaking for equitable, sustainable cities 为公平、可持续的城市制定政策
Pub Date : 2024-09-27 DOI: 10.1038/s44284-024-00139-0
In this issue of Nature Cities, we highlight the policy relevance of urban research to a variety of domains. These applications also foreground the importance of city policy for mediating connections between human society and the natural environment.
在本期《自然-城市》杂志中,我们将重点介绍城市研究与各个领域的政策相关性。这些应用也凸显了城市政策对于协调人类社会与自然环境之间联系的重要性。
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引用次数: 0
Water wonderland or water nightmare 水上仙境还是水上噩梦
Pub Date : 2024-09-27 DOI: 10.1038/s44284-024-00131-8
R. Marie Garcia
Water is life. Water is beautiful. Water is dangerous. Water researcher Marie Garcia reflects on how building meaningful relationships with Detroiters helps to shape her relationship with the city, especially as its longest-term residents struggle with worsening flood impacts on their homes and lives.
水是生命。水是美丽的。水是危险的。水研究员玛丽-加西亚(Marie Garcia)思考了与底特律人建立有意义的关系如何有助于塑造她与这座城市的关系,尤其是在底特律的长期居民正努力应对洪水对其家园和生活造成的日益恶化的影响时。
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引用次数: 0
A universal framework for inclusive 15-minute cities 15 分钟包容性城市通用框架
Pub Date : 2024-09-16 DOI: 10.1038/s44284-024-00119-4
Matteo Bruno, Hygor Piaget Monteiro Melo, Bruno Campanelli, Vittorio Loreto
Proximity-based cities have attracted much attention in recent years. The ‘15-minute city’, in particular, heralded a new vision for cities where essential services must be easily accessible. Despite its undoubted merit in stimulating discussion on new organization of cities, the 15-minute city cannot be applicable everywhere, and its very definition raises a few concerns. Here we tackle the feasibility and practicability of the 15-minute city model in many cities worldwide. We provide a worldwide quantification of how close cities are to the ideal of the 15-minute city. To this end, we measure the accessibility times to resources and services, and we reveal strong heterogeneity of accessibility within and across cities, with a pivotal role played by local population densities. We provide an online platform ( https://whatif.sonycsl.it/15mincity/ ) to access and visualize accessibility scores for virtually all cities worldwide. The heterogeneity of accessibility within cities is one of the sources of inequality. We thus simulate how much a better redistribution of resources and services could heal inequity by keeping the same resources and services or by allowing for virtually infinite resources. We highlight pronounced discrepancies among cities in the minimum number of additional services needed to comply with the 15-minute city concept. We conclude that the proximity-based paradigm must be generalized to work on a wide range of local population densities. Finally, socio-economic and cultural factors should be included to shift from time-based to value-based cities. How widespread is the possibility of creating ‘15-minute cities’? Using openly available data, the authors measure access to essential services and what points of interest would have to be relocated to create 15-minute cities. With novel quantification, they demonstrate remarkable differences among cities across different regions of the globe.
近年来,以近距离为基础的城市备受关注。特别是 "15 分钟城市",它预示着一种新的城市愿景,即基本服务必须方便可及。尽管 "15 分钟城市 "的优点毋庸置疑,它激发了人们对城市新组织形式的讨论,但它不可能在所有地方都适用,而且其定义本身也引发了一些担忧。在此,我们将探讨 15 分钟城市模式在全球许多城市的可行性和实用性。我们对全球城市与 15 分钟城市理想的接近程度进行了量化。为此,我们测量了资源和服务的可达性时间,并揭示了城市内部和城市之间可达性的强烈异质性,其中当地的人口密度发挥了关键作用。我们提供了一个在线平台(https://whatif.sonycsl.it/15mincity/),用于获取全球几乎所有城市的可达性得分并将其可视化。城市内部交通便利程度的差异是不平等的根源之一。因此,我们模拟了在保持资源和服务不变或允许资源几乎无限的情况下,更好地重新分配资源和服务能在多大程度上消除不平等。我们强调了各城市之间在符合 15 分钟城市概念所需的最低额外服务数量方面存在的明显差异。我们的结论是,必须对基于邻近性的范式进行推广,使其适用于各种当地人口密度。最后,要从基于时间的城市转变为基于价值的城市,还应考虑社会经济和文化因素。创建 "15 分钟城市 "的可能性有多大?作者利用公开数据,测量了基本服务的可及性,以及为创建 15 分钟城市而必须迁移的兴趣点。通过新颖的量化方法,他们展示了全球不同地区城市之间的显著差异。
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引用次数: 0
Quantifying the 15-minute city concept 量化 15 分钟城市概念
Pub Date : 2024-09-16 DOI: 10.1038/s44284-024-00122-9
Haroldo V. Ribeiro
Amid growing urbanization, the 15-minute city model seeks to transform city living by ensuring that essential services are just a short walk away from city inhabitants. New research now quantitatively measures this urban ideal, revealing significant disparities in access across cities globally.
在城市化不断发展的过程中,"15 分钟城市模式 "试图通过确保城市居民只需步行即可获得基本服务来改变城市生活。现在,新的研究对这一城市理想进行了量化测量,揭示了全球各城市在获取服务方面存在的巨大差距。
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引用次数: 0
Urban rooftops for food and energy in China 中国城市屋顶的粮食和能源
Pub Date : 2024-09-16 DOI: 10.1038/s44284-024-00127-4
Rui Yang, Chao Xu, Haoran Zhang, Zhen Wang, Prajal Pradhan, Xihong Lian, Limin Jiao, Xuemei Bai, Shenghui Cui, Yuanchao Hu, Yong-Guan Zhu
Urban rooftop agriculture (RA) and photovoltaic power production (RPV) offer sustainable solutions for the food–energy nexus in cities but compete for limited rooftop space. Here we explore the potential benefits (productivity, economic and environmental) and allocation strategy of RA and RPV across 13 million buildings in 124 Chinese cities, considering urban characteristics and regional productivity. We found that RA yields superior economic benefits, while RPV excels in greenhouse gas emission reductions. Prioritizing either RA or RPV can only retain 0–29% of the above benefits brought by the other. However, allocating 61% of the flat rooftop area to RA and all the remaining (including pitched rooftops) to RPV would retain >50% of their potential, meeting 15% (mean, 0.5–99% across cities) of urban vegetable needs and 5% (0.5–27% across cities) of the electricity needs. While the productivity from RA and RPV have significant environmental and socioeconomic benefits, they require considerable water (up to 15% of urban residential water use) and materials (for example, totaling 13 kt silver). This study proposes that the optimal allocation of roof area for rooftop agriculture and photovoltaics is 61% of the flat rooftop area to the former and the rest for the latter. However, maintaining this productivity requires considerable water use and materials.
城市屋顶农业(RA)和光伏发电(RPV)为城市中的粮食与能源关系提供了可持续的解决方案,但却要争夺有限的屋顶空间。在此,我们结合城市特点和区域生产力,在中国 124 个城市的 1300 万栋建筑中探讨了屋顶农业和光伏发电的潜在效益(生产力、经济和环境)和分配策略。我们发现,RA 能产生更优越的经济效益,而 RPV 则能减少温室气体排放。优先考虑 RA 或 RPV 只能保留对方带来的上述效益的 0-29%。然而,如果将 61% 的平屋顶面积分配给太阳能电池板,将其余所有面积(包括斜屋顶)分配给太阳能光伏发电,则可保留其 50% 的潜力,满足 15% 的城市蔬菜需求(各城市平均值为 0.5-99%)和 5% 的电力需求(各城市平均值为 0.5-27%)。虽然RA和RPV的生产力具有显著的环境和社会经济效益,但它们需要大量的水(高达城市居民用水量的15%)和材料(例如,总计13千吨银)。本研究提出,屋顶农业和光伏发电的最佳屋顶面积分配为前者占平屋顶面积的 61%,后者占平屋顶面积的其余部分。然而,要维持这一生产率,需要大量用水和材料。
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引用次数: 0
Operationalizing climate justice in the implementation of Boston’s Building Performance Standard 在波士顿建筑性能标准的实施过程中落实气候正义
Pub Date : 2024-09-13 DOI: 10.1038/s44284-024-00121-w
Claudia V. Diezmartínez, Benjamin K. Sovacool, Anne G. Short Gianotti
Cities are moving toward the implementation of more just urban climate actions, but the politics and processes of operationalizing climate justice in practice remain understudied. Here we examine the implementation of climate justice through Boston’s Building Emissions Reduction and Disclosure Ordinance (BERDO), a landmark Building Performance Standard that reflects a transformative shift towards carbon neutrality in cities. We utilize a rich mixed-methods research design that is rooted in 5 months of participant observation within the City of Boston’s Environment Department, 20 expert interviews and a systematic content analysis of hundreds of policy documents. We find that implementing BERDO entails political contestation over differing conceptions of resistance and power relations around climate justice. Justice becomes subject to scope and scale discrepancies, the processes of bureaucratization and even weaponization. In documenting these tensions, we provide insights into the complex challenges that cities may face as they begin to operationalize climate justice on the ground. City governments are moving to integrate justice and equity concerns into climate action. Diezmartínez et al. demonstrate that contestations about the politics of climate justice were central during the first 2 years of implementation for a Boston building decarbonization policy, highlighting important challenges in translating climate justice into practice. Nature Cities is proud that this robust work is our first fully qualitative methods study.
城市正朝着实施更加公正的城市气候行动迈进,但在实践中实现气候公正的政治和过程仍未得到充分研究。在此,我们通过波士顿的《建筑减排和信息披露条例》(BERDO)来研究气候正义的实施情况,该条例是一项具有里程碑意义的建筑性能标准,反映了城市向碳中和的转变。我们采用了丰富的混合方法研究设计,在波士顿市环境部门进行了为期 5 个月的参与观察、20 次专家访谈,并对数百份政策文件进行了系统的内容分析。我们发现,在实施《波士顿环境与发展法案》的过程中,围绕气候正义的不同抵制概念和权力关系引发了政治争论。正义受到范围和规模差异、官僚化进程甚至武器化的影响。在记录这些紧张关系的过程中,我们深入了解了城市在开始实际操作气候正义时可能面临的复杂挑战。城市政府正着手将正义和公平问题纳入气候行动。Diezmartínez 等人的研究表明,在波士顿建筑脱碳政策实施的头两年中,有关气候正义政治的争论是核心问题,这凸显了将气候正义转化为实践的重要挑战。自然城市 "非常自豪,因为这是我们第一项完全采用定性方法的研究。
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引用次数: 0
Implementing climate justice in Boston’s Building Performance Standard 在波士顿建筑性能标准中落实气候正义
Pub Date : 2024-09-13 DOI: 10.1038/s44284-024-00129-2
Claudia V. Diezmartínez, Benjamin K. Sovacool, Anne G. Short Gianotti
Boston’s Building Emissions Reduction and Disclosure Ordinance (BERDO) provides an early example of how contestations around climate justice are already shaping cities’ implementation of climate action on the ground. As a landmark in equitable implementation efforts, BERDO highlights important challenges in putting climate justice into practice, including working within a program’s scope and scale constraints, translating justice goals into bureaucratic processes, and managing the potential weaponization of justice claims.
波士顿的《建筑物减排和信息披露条例》(BERDO)提供了一个早期的例子,说明围绕气候正义的争论如何影响城市在当地实施气候行动。作为公平实施努力的一个里程碑,《建筑减排和披露条例》强调了将气候正义付诸实践的重要挑战,包括在计划的范围和规模限制内开展工作、将正义目标转化为官僚程序,以及管理正义诉求的潜在武器化。
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引用次数: 0
Building justice in Boston 在波士顿伸张正义
Pub Date : 2024-09-13 DOI: 10.1038/s44284-024-00130-9
Tanesha A. Thomas
Cities are grappling with climate change. A study examines the mechanisms of climate justice policy in Boston, Massachusetts, including efforts to incorporate various definitions of justice into urban climate policy.
城市正在努力应对气候变化。一项研究探讨了马萨诸塞州波士顿的气候正义政策机制,包括将各种正义定义纳入城市气候政策的努力。
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引用次数: 0
Urban biodiversity is affected by human-designed features of public squares 城市生物多样性受到人类设计的公共广场特征的影响
Pub Date : 2024-09-11 DOI: 10.1038/s44284-024-00126-5
Andrew J. Fairbairn, Sebastian T. Meyer, Maximilian Mühlbauer, Kirsten Jung, Beate Apfelbeck, Katherine Berthon, Andrea Frank, Lea Guthmann, Jana Jokisch, Kristel Kerler, Nina Müller, Christina Obster, Michaela Unterbichler, Johanna Webersberger, Juliane Matejka, Paul Depner, Wolfgang W. Weisser
Cities are designed primarily for the benefit of humans but also provide habitat for other species. However, understanding how different components of urban vegetation and other features of urban spaces enable different species or species groups to live in the city remains limited. Here we show that, for the City of Munich, designed features of public urban squares strongly determine the occurrence of different species groups. While taxon richness and abundance increased with increasing ‘greenness’ of the square, different taxa responded to different square features, such as the proportion of lawn, the volume of shrubs and the density of trees, as well as the number of people or pets on these squares. Our results highlight that urban design for human needs affects other species that may cohabit these spaces. Consequently, planning strategies for biodiverse cities that aim to enhance human–nature interactions need to be multifaceted, considering the needs of humans and other taxa to create diverse living cities. The iconic image of ‘the public square’ typifies many cities in Europe and elsewhere, but they transcend spaces for socializing and public deliberation. Focusing on Munich, this study analyzes whether and how design features of public urban squares affect the broader biodiversity living there, finding that greenness matters but that different taxa respond differently to design elements.
城市的设计主要是为了人类的利益,但也为其他物种提供了栖息地。然而,人们对城市植被的不同组成部分以及城市空间的其他特征如何使不同物种或物种群在城市中生存的了解仍然有限。在这里,我们表明,在慕尼黑市,城市公共广场的设计特征在很大程度上决定了不同物种群的出现。随着广场 "绿化 "程度的增加,分类群的丰富度和丰度也随之增加,不同的分类群对不同的广场特征(如草坪的比例、灌木的数量、树木的密度以及广场上的人或宠物的数量)做出了反应。我们的研究结果突出表明,为满足人类需求而进行的城市设计会影响到可能与这些空间共存的其他物种。因此,以加强人与自然互动为目标的生物多样性城市规划策略必须是多方面的,要考虑到人类和其他类群的需求,以创建多样化的生活城市。公共广场 "是欧洲和其他地区许多城市的标志性形象,但它们超越了社交和公共讨论的空间。本研究以慕尼黑为重点,分析了城市公共广场的设计特征是否以及如何影响生活在那里的更广泛的生物多样性,发现绿化很重要,但不同的类群对设计元素的反应也不同。
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引用次数: 0
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