Green development and circular economy are vital means for sustainable development. This paper, based on China’s 279 prefectures’ 2004 to 2018 panel data, uses urban minerals demonstrating base policy as a para-natural test to establish a DID （differences-in-differences） model, which is employed to study the impacts of construction of urban minerals demonstrating base on relieving environmental pollution, and the adjusting effect of research inputs and marketization degree. The results show that construction of urban minerals demonstrating base outstandingly relieves environmental pollution, which is offset by research inputs and marketization degree. Size heterogeneity test indicates that construction of urban minerals demonstrating base have less influence on relieving tier1 urban environmental pollution than non-tier 1. Regional heterogeneity shows that construction of urban minerals demonstrating base variably relieves urban environmental pollution, less in the central cities, strong in the eastern, and strongest in the western. Batch heterogeneity shows that 2015 demonstrating bases have the premium results, while 2012 just don’t. which is also validated by PSM-DID stability test. Empirical study on impacts and effects of construction of urban minerals demonstrating base can theoretically improve China’s performance evaluation framework in urban minerals demonstrating base policies, and practically help develop China’s circular economy. This paper presents scientific supports and theoretical basis for China to appropriately develop urban minerals, to reach green sustainable development and circular economy.

Industrial green development is a key approach to urban pollution emission and energy consumption, and largely boosts its green sustainability. This paper, based on Zhejiang's 2000—2019 industrial economic panel data, uses Cobb-Douglas production function model to explore the impacts of environmental regulations intensity on Zhejiang's industrial green development, and divides Zhejiang into four areas ad two categories of urban sizes, and empirically studies the heterogenous effects ofenvironmental regulations intensity on industrial green development. Environmental regulations intensity largely decreases Zhejiang's unit energic consumption, outstandingly boosting its industrial green development, but the impacts vary, better in western and southern Zhejiang than in eastern and northern. Environmental regulations intensity improves their industrial green development in cities with variable populations, better in middle-small cities than in large cities in reducing unit energic consumption. Environmental regulations can still largely decrease unit GDP energic consumption after removal of model's endogenous issues, verifying the stability of model. The overall marketization level plays a key role in decreasing the unit regional GDP energic consumption by environmental regulations intensity, and marketized environmental regulations also reduce Zhejiang's overall unit regional GDP energic consumption. This paper presents suggestions for Zhejiang to make appropriate environmental regulations intensity in order to push industrial green development and quality economic growth.

This paper, based on China's urban mining pilot bases, uses fuzzy-set qualitative analysis method to comprehensively study 48 cities with urban mining pilot bases and 28 cities without urban mining pilot bases, and their establishing factors and modes. Establishment of China's urban mining pilot bases is influenced by ventilation coefficient, industrial basis, governmental enforcement, transport infrastructure and environmental regulations. High air ventilation coefficient and developed infrastructure are core conditions. Good manufacturing industry supplies renewable materials which plays a key role in establishing urban mining pilot bases. Low-cost consumption is a necessity, and governmental policy is an auxiliary. Governmental industrial planning can play a positive part when industrial manufacturing basis and infrastructures lack. Air circulation and environmental regulation are two complementary conditions for government to control and reduce pollution. Strict governmental regulations play a key role in establishing inland urban mining pilot bases with low air circulations coefficients. Government-oriented establishing model focuses on supporting roles of policies and air ventilation, and elementoriented establishing model stresses the impacts of industrial basis and transport infrastructure. 

This paper, based on C-D production theory, applies VAR model and impulse response function and variance decomposition to analyze the dynamic relation between copper scrap imports and valve exports during 2000 to 2013, with the result showing that Taizhou's copper scrap import not only is the Granger cause of valve export, but also casts hysteresis and retrogression on valve export. Taizhou needs to maintain copper scrap import to meet its local manufacturing in order to develop its green sustainable economy.