A framework for environmental decision support in cities incorporating organizational LCA

摘要

Purpose Cities contribute to and are affected by several environmental pressures within and beyond city boundaries. Urban decision makers struggle to find environmentally sound strategies while respecting their obligation to provide the basis for a viable society. Methods to assess the environmental performance of cities beyond greenhouse gases either lack a holistic or multi-impact perspective which limits the informational value of recommendations for improvement. Life cycle assessment (LCA) is already seen as a promising tool to overcome this gap although research on LCA at city scale is still in its infancies. This paper introduces a novel approach for city-scale environmental decision support and extends the current methodological discussion to organizational LCA (OLCA). Methods A four-step procedure was followed. Firstly, a universal city structure was developed by reviewing different city characteristics and by conducting a virtual case study. Secondly, this structure was split into assessment levels by a stakeholder analysis to reflect different levels of decision support. Thirdly, OLCA's capabilities to cover the required assessment levels were evaluated. Lastly, methodological uncertainties were discussed, and the assessment framework was finalized by giving guidance on how to extend OLCA to city needs. Results An environmental assessment framework containing four assessment levels is proposed. Results show that OLCA is well suited to estimate potential environmental impacts associated with the provision of public services by the local government (level 1) and by contracted companies (level 2). Methodological challenges were encountered regarding the uncertain definition of the local government's influence on private activities beyond public service provision (level 3a). Including activities that are neither directly nor indirectly influenced by the local government go beyond OLCA's capabilities (level 3b). Conclusions The framework proposed will support local governments in tracking their environmental performance, prioritizing mitigation measures, and considering transformational change in their strategic decisions. The organizational perspective makes OLCA a valuable approach for decision support at city level. This perspective, however, does not allow to capture all activities taking place within the city boundary and methods have to be found that adequately estimate a local government's influence beyond public service provision. When aiming at developing long-term strategies to improve a city's environmental performance, future availability of new technologies and business models that may further impact a local government's influence need to be considered.