The change in the material stock of urban infrastructures in China

The materials stocked in infrastructures comprehensively reflect resource consumption, waste generation and sustainable development; therefore, research investigating this topic is particularly important. First, this paper uses the bottom-up material flow analysis method to account for the material stocks (MS) in urban infrastructures and examines the spatial and temporal changes in the MS in China from 1997 to 2016. The results show that MS increased 4.04 times during this period and are spatially inclined to decrease from coastal regions to inland areas. Second, this paper combines the population and economic factors using the IPAT model (which considers the environmental Impact as a product of the Population, Affluence and Technology) and a panel data regression analysis to conclude that affluence is the major driving factor increasing MS, while the impact of technology has a negative effect throughout China. The effect of affluence in different regions is consistent with that throughout China, but the population and technology changes have different effects. Third, this study estimates the environmental impact under different scenarios and proposes suggestions and strategies for promoting sustainable development. (C) 2019 Elsevier B.V. All rights reserved.