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	Efficiency evaluation of material and energy flows, a case study of Chinese cities
	Song T.; Yang, Z. S.; Chahine, T.
	2016
关键词	Case study Chinese cities Data envelopment analysis Efficiency Material and energy flows Principal component analysis data envelopment analysis urban metabolism undesirable outputs dea approach pca power model
英文摘要	The environmental impact of materials and energy is an important concern when cities and regions produce goods and services. To examine this requires an evaluation tool which can deal with the complex system of resources, energy inputs, products and wastes involved. This paper evaluates the urban material and energy flow efficiencies of 31 cities in China using a combination of the Data Envelopment Analysis model and Principal Component Analysis method. The results show that the urban flow system is composed of several input and output principal components, including energy, materials, urban capital investment, overall output, wastes, and others. In 2010, 16 cities were efficient as judged by the material and energy inputs and outputs. The remaining 15 cities were not efficient, primarily due to product shortfalls and waste excesses. Since 2000, half of the analyzed cities experienced a decline in the urban flow efficiencies, while only six cities showed a positive trend. The reasons include excess inputs of coal, coke, electricity, cement, investment, as well as output shortfalls in terms of overall output, wastes, services, agriculture and transport. We conclude that key priorities for improving urban systems with material and energy flow inefficiency are the use of urban renewable supplies, focus on sustainable endogenous development model, and improvement management of waste output, in order to increase efficiency and sustain economic growth. (C) 2015 Elsevier Ltd. All rights reserved.
出处	Journal of Cleaner Production
卷	112
页	3667-3675
语种	英语
ISSN号	0959-6526
DOI标识	10.1016/j.jclepro.2015.08.080
内容类型	SCI/SSCI论文
源URL	[http://ir.igsnrr.ac.cn/handle/311030/43201]
专题	地理科学与资源研究所_历年回溯文献
推荐引用方式 GB/T 7714	Song T.,Yang, Z. S.,Chahine, T.. Efficiency evaluation of material and energy flows, a case study of Chinese cities. 2016.

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