agglomeration size and economic development. This approach provides the opportunity to test the so-called Kuznets sustainability curve under two different conditions, viz. Our contribution serves to assess - by means of regression techniques - the highest performing agglomerations among the urban sustainability champions on the basis of the two above-mentioned assessment criteria. in terms of both agglomeration size (big or medium-sized) and the economic development level of the area (highly developed or developing/emerging). In the framework of our original DEA approach, these urban areas are categorised according to 2x2 dimensions, viz. We regard both the size of these agglomerations and their economic welfare position as critical parameters for assessing their economic and environmental efficiency performance. This approach will be applied empirically by examining the GPCI data set comprised of various multi-dimensional and empirically verified indicators on economic performance and climatological-environmental conditions for the 40 global cities concerned. Our ultimate goal is to test what is termed the 'delinking' hypothesis, from the viewpoint of both economic prosperity and urban size externalities. We compare 40 global cities - included in the Global Power City Index (GPCI) database - in a benchmark study in order to trace the highest-performing urban regions from both an economic and environmental-climatological efficiency perspective, by applying relevant quantitative GPCI indicators to these 40 cities. This paper aims to present and test an advanced methodology for assessing economic and sustainability-oriented performance strategies for global cities, by developing and applying a super-efficient Data Envelopment Analysis (DEA) model. Clearly, the efficiency of these outcomes may differ for different types of urban agglomeration in the world.
Urban agglomerations - irrespective of their size or location - may act not only as engines of economic growth, but also as vehicles of environmental and climate sustainability that may stimulate both socio-economic achievements and environmentally-benign outcomes.
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