Educational Differences in Cycling: Evidence from German Cities

Cycling is an environmentally sustainable social practice that contributes to liveable cities and provides affordable and healthy transport. People with lower education could particularly benefit from cycling, as they tend to fare worse regarding finances and health. However, in bivariate analyses, those with lower education cycle less. This article discusses the social meaning of cycling and investigates whether the education–cycling association holds after accounting for (1) confounders and (2) factors that determine decision leeway between different transport modes. I analyse approximately 80,000 short-distance trips (0.5–7.5 km) reported by 28,000 working-age individuals from cities in Germany using multilevel linear probability regression models. Results support that higher education systematically and substantially increases the propensity to cycle. This education gap implies major untapped potential for environmental sustainability, that current pro-cycling policies in cities disproportionally favour the highly educated and that cycling patterns contribute to inequalities in finances and health.

Free-Riding for Future: Field Experimental Evidence of Strategic Substitutability in Climate Protest

We test the hypothesis that protest participation decisions in an adult population of potential climate protesters are interdependent. Subjects (n=1,510) from the four largest German cities were recruited two weeks before protest date. We measured participation (ex post) and beliefs about the other subjects' participation (ex ante) in an online survey, used a randomized informational intervention to induce exogenous variance in beliefs, and estimated the causal effect of a change in belief on the probability of participation using a control function approach. Participation decisions are found to be strategic substitutes: a one percentage-point increase of belief causes a .67 percentage-point decrease in the probability of participation in the average subject.

Free-Riding for Future: Field Experimental Evidence of Strategic Substitutability in Climate Protest

We test the hypothesis that protest participation decisions in an adult population of potential climate protesters are interdependent. Subjects (n=1,510) from the four largest German cities were recruited two weeks before protest date. We measured participation (ex post) and beliefs about the other subjects' participation (ex ante) in an online survey, used a randomized informational intervention to induce exogenous variance in beliefs, and estimated the causal effect of a change in belief on the probability of participation using a control function approach. Participation decisions are found to be strategic substitutes: a one percentage-point increase of belief causes a .67 percentage-point decrease in the probability of participation in the average subject.

Characterizing Physical and Social Compositions of Cities to Inform Climate Adaptation: Case Studies in Germany

Cities are key to climate change mitigation and adaptation in an increasingly urbanized world. As climate, socio-economic, and physical compositions of cities are constantly changing, these need to be considered in their urban climate adaptation. To identify these changes, urban systems can be characterized by physical, functional, and social indicators. Multi-dimensional approaches are needed to capture changes of city form and function, including patterns of mobility, land use, land cover, economic activities, and human behaviour. In this article, we examine how urban structure types provide one way to differentiate cities in general and to what extent socio-economic criteria have been considered regarding the characterization of urban typologies. In addition, we analyse how urban structure types are used in local adaptation strategies and plans to derive recommendations and concrete targets for climate adaptation. To do this, we examine indicators, background data used, and cartographic information developed for and within such urban adaptation plans, focusing in particular on the German cities of Karlsruhe and Berlin. The comparative analysis provides new insights into how present adaptation plans consider physical and social structures, including issues of human vulnerability within cities. Based on the analysis we make recommendations on how to improve the consideration of both physical and socio-economic aspects of a city to support pathways for adaptation.

People, Place, and Politics: Local Factors Shaping Middle‐Class Practices in Mixed‐Class German Neighbourhoods

This article takes a nuanced look at the role played by neighbourhood characteristics and local policies in facilitating or limiting the ways in which diversity‐oriented middle‐class families interact and deal with people of lower social classes in mixed‐class inner‐city neighbourhoods. The study draws on interviews and social network analysis conducted in neighbourhoods with different socio‐economic characteristics in the German cities of Hanover and Dusseldorf. A comparative view allows us to analyse how neighbourhood characteristics and local policies influence middle‐classes’ interactions across social boundaries. Our aim is to contribute to ongoing debates on urban policy options: In discussing the conditions encouraging cross‐boundary interactions of specific middle‐class fractions, we argue that the scope of local‐level action is not fully recognized in either policy or academic debates.

A deferred acceptance mechanism for decentralized, fast, and fair childcare assignment

We design and implement a program-proposing deferred acceptance mechanism with ties (DAT) and apply it to childcare assignment in two German cities. The mechanism can accommodate complementarities in providers' preferences, is fast to terminate even in larger cities, is difficult to manipulate in practice, and produces stable allocations. It can be further sped up by introducing two new features. First, allowing for an arbitrary share of facilities who participate in a centralized manner by submitting a rank-order-list over applicants. Second, by breaking ties in applicants' rank-order-lists on a first-come-first-serve basis, which sets incentives for programs to propose faster. We provide and evaluate simulation results.

Costs and optimisation options for monitoring of indirect dischargers

Monitoring of indirect and industrial dischargers, respectively, makes an important contribution to the safe and environmentally sound operation of wastewater systems. As a result of local framework conditions, there is a wide range of monitoring practices across Germany. In a benchmarking project, ten sewerage operators and monitoring bodies representing large German cities have collected data on their work and discussed their practices. The results show that the extent of monitoring is between 244 and 1,457 monitoring points per sewer network (given as 15th and 85th percentile). The median value of the specific expense is 689 EUR per monitoring point and year. In relation to the total wastewater fee volume, the median expense is 0.71%. The sub-process ‘sampling’ was examined more closely. By means of detailed process mapping and regression analyses, it can be shown that on-site activities and tours have the largest share of working time (total of 72%) and thus the greatest leverage in optimisation measures. Various examples are given.

Reconstructing historical context. German cities and the case of Lübeck

La més o menys plausible reconquesta de la imatge històrica construïda segle rere segle i violentament eliminada per la guerra i les intervencions de caire infrastructural de les següents dècades, planteja preguntes cabdals i ineludibles en l’actual debat sobre contextos històrics i en la relació entre allò vell i allò nou, més enllà d’una noció d’autenticitat que encara és massa indeterminada. És precisament en aquest marc on trobem l’explicació per les intervencions de reconstrucció en Alemanya, considerades ací com respostes madures i conscients a una nova fase reconstructora de centres històrics. Dins de la història de la reconstrucció, són, per tant, paradigmàtiques per les preguntes que suggereixen, però també per les solucions concretes que ofereixen en la seua relació dialèctica entre còpia i reinterpretació. Per aquesta raó, no poden ser tractades com a simples casos de reconstrucció estilística, sinó que han de ser avaluades com a projectes genuïns d’arquitectura contemporània. El reviscolat de l’estructura mínima del parcellarium, que sovint a requerit la demolició de grans complexos edificats entre les dècades dels seixanta i dels vuitanta del segle XX, es converteix en el comú denominador d’aquestes experiències recents. El model mixt adoptat en aquests casos està basat en la coexistència de Leitbauten i de Neubauten, és a dir, edificis pilots reconstruïts d’acord amb els originals i en nous edificis inspirats pels originals.