Suchergebnisse

Material flows in the construction and demolition (C&D) sector remain high in many countries. But, their changes or reductions are essential for successful circular economies. Existing material flow analyses do not cover regional characteristics, stakeholders and impacts of policy measures and interactions. We contribute a new, unprecedented way of integrating regional building and infrastructure material stock and flow modelling with stakeholders, policy measures, their impacts and mutual interactions. Stakeholders are considered with their objectives, influences, interactions, willingness to act, to cooperate or contribute to resource conservation. 31 policy measures are crystallized from literature and evaluated in two surveys regarding their expected impact, their bundling and temporal effects. The integrated bottom-up simulation model was tested for the federal state of Baden-Württemberg (Germany). The results show that until 2030 net stock piling can be expected and secondary raw materials from building stock will be sufficient to supply future recycling concrete production until 2030. Most effective policy measures are additional cost/taxes on primary resources, increased disposal fees and curriculae adaption. Bundling these leads to a combined RESPOT of 30.8%. The results are useful for political decision makers, educational institutions, disposal site operators as well as primary and secondary raw material extraction ...

In recent decades, the shortage of natural resources like primary raw materials has increasingly shifted into the focus of public discussion and research. Especially in the resource-intensive construction sector the implementation of a circular economy can strongly contribute to a reduction of primary resource demand. Positive developments can be noticed already, but the desired goal of an effective circular economy is still not being reached. For instance, the usage of recycled raw materials as substitutes for primary resources could be significantly higher. In order to implement the protection of resources in the construction sector, it is essential to assess resource-saving measures and their impact on conservations as well as stakeholders motivation to implement them. For this purpose, a Stakeholder-based Assessment Model (SAM) is introduced to provide recommendations for political actions and potent measures to foster the circular economy in the construction sector that lead to increased reuse and recycling of construction materials. In the SAM, relevant actors are identified and their characteristics and preferences as well as the level of influence on each other are modelled and validated for Germany. Moreover, available resource-conserving measures concerning the construction sector are identified and related measures are grouped together. Thereupon the influence of measures on stakeholders and their willingness to take positive actions in terms of a circular economy have been investigated and modelled. Relevant model data has been gathered by intensive literature review, surveys and expert interviews. The results show that measures regarding lifecycle oriented planning of buildings as well as the development of stakeholder cooperation are the most effective ones to save resources and to reduce the disposal of construction material. Furthermore the results demonstrate that a leading role of public authorities is crucial to foster a circular ...

In times of fast-growing stakeholder interest in sustainability, the ecological and social perspective of industrial companies and its products is gaining increasing importance. In particular, the emission of greenhouse gases (GHG) in the automotive industry has come to the forefront of public and governmental attention. The transport sector accounts for 27% of all European GHG emissions and constitutes the largest emitter of CO2e (CO2 equivalents) among all energy demanding technologies. Due to increasingly efficient combustion engines and technology innovation towards e-mobility, the emissions from car manufacturing gain in importance. So far little focus has been laid upon the emissions created throughout the production process in automotive supply chains from a purchasing perspective. The purchasing of raw material from environmentally efficient suppliers can constitute a possibility to significantly reduce CO2e emissions in automotive supply chains and thus contribute to the two degrees global warming goal. Supplier selection decisions, which cover approximately 75% of the value adding process of a car, are today mainly cost and quality-driven. In order to integrate CO2e as decision criterion for supplier selections, site-specific and comparable data on CO2e emissions from the upstream supply chain is necessary, but currently lacking. To estimate CO2e emissions of steel suppliers' production sites, a model has been developed to estimate manufacturing processes on a site-specific level without the necessity of confidential primary data. The model is applied on 22 integrated steel mills in EU-15. The results, which can be transferred and used for various products and industries, e.g. the construction industry, demonstrate the partially large disparities of manufacturing efficiency regarding CO2e emissions among steel manufacturers due to different levels of process integration and internal process know-how. A range between 1879 and 2990 (kg CO2e/t crude steel) has been revealed. Finally, the estimated data on ...

Müller, Richard Matthias: Gedanken zur deutschen "Vergangenheitsbewältigung", S. 886-891; Miller, Susanne: Die Deutschen - ein Volk von Tätern? Die Goldhagen-Debatte, S. 891-894; Hecht, Ingeborg: "Hier fliegen keine Schmetterlinge